Free small tools
for people and
AI agents.
No sign-up.
Tools by category
215 small tools
Images
AI Image Upscaler
Enlarge pictures 2x or 4x with a small AI model on your device. Keep transparency and download PNG, JPG or WebP.
Product Photo Background Remover
Cut out a product in your browser. Download transparent PNG or add a white or custom colour background.
Image to SVG Tracer
Turn logos, drawings and photos into SVG vector paths. Trace colours and remove backgrounds in your browser.
Image compressor
Make JPEG, PNG and WebP images smaller on your device.
Image converter: WebP to PNG, PNG to JPG
Change images to JPG, PNG or WebP.
PNG to JPG Converter
Convert a PNG file to JPG free in your browser. JPEG is selected by default; adjust quality, turn transparent areas white and save each image. No uploads.
WebP to JPG converter
Turn WebP images into JPG files, many at once.
Image to Text
Read photos, screenshots and scans into editable text in six languages. Your images stay in your browser.
Image resizer
Change image size by width, height or percentage.
Flip Image
Flip an image horizontally or vertically for free. Mirror a batch of JPG, PNG or WebP files in your browser and save each one in its original format. Nothing is uploaded.
GIF maker
Turn images or a short video into a GIF.
MP4 to Animated GIF
Convert MP4 to animated GIF free from a local file. Choose a clip, size, frame rate and looping in your browser. No upload; up to 15 seconds and 150 frames.
GIF resizer
Resize an animated GIF in your browser for free. Change width and height, keep frame timing and download a resized GIF. No upload or sign up.
WebP to GIF converter
Convert static or animated WebP to GIF free in your browser. Keep all animation frames and their timing, choose a size and download. Nothing is uploaded.
Animated GIF cropper
Crop an animated GIF online free. Drag a rectangle over the animation or enter exact pixels, then save a cropped GIF with frame timing kept. No upload.
Photo Collage Maker
Combine 2–9 photos in a grid or featured layout. Adjust gaps and background colour, then save PNG or JPEG in your browser.
PDF
Compress PDF
Shrink PDF images privately, with selectable text or smaller image pages.
Free PDF Editor Online
Edit a PDF free online: add text, white-out, images and signatures, then rotate or rearrange pages. Files stay in your browser, with no upload or sign up.
EPUB to PDF Converter
Convert EPUB books to PDF privately in your browser, with page sizes, images and a table of contents.
PDF merger
Put several PDFs together in the order you choose.
JPG to PDF converter
Put images together in one PDF.
PNG to PDF Converter
Convert PNG to PDF free in your browser. Order your PNG images, choose Fit image, A4 or Letter and margins, then save one PDF. No upload or sign up.
Fillable PDF Form Builder
Open a PDF or start blank, place form fields, and download a fillable PDF. Your PDF stays in this browser.
PDF to Word and Excel
Convert text PDFs into editable text and tables. Preview and download Word or Excel files in your browser.
PDF to JPG converter
Turn PDF pages into JPG or PNG images.
PDF to PNG Converter
Convert PDF to PNG free in your browser. Choose page ranges and image scale, then save lossless PNG page images individually or in a ZIP. Nothing is uploaded.
Redact PDF
Redact a PDF for real: draw boxes or find text, and covered pages become pictures so the hidden text is gone. No upload.
Word to PDF
Convert a Word .docx to PDF in your browser. Preview it, then save a PDF with selectable text. No upload; complex layouts may shift.
Sign PDF
Sign a PDF in your browser: draw, type or upload your signature, place it with a date and initials, and save. No upload.
PDF Splitter
Extract PDF page ranges into one PDF, or save one PDF per page in a ZIP. Text stays selectable. Nothing is uploaded.
HTML to PDF
Paste HTML or open a local HTML file, preview a printable document and choose Save as PDF in your browser.
Markdown to PDF
Turn Markdown headings, lists, tables and code blocks into a printable document. Preview locally and choose Save as PDF.
Crop PDF
Trim PDF margins with page previews and selected page ranges. Text stays selectable; cropping hides content without deleting it. Nothing is uploaded.
PDF to Text
Extract selectable PDF text in your browser. Copy or save a text file with page breaks kept; scanned PDFs need an existing text layer.
Text
APA Citation Generator
Format APA 7 references, build an alphabetical reference list and export Word with italics and hanging indents.
Text and Subtitle Translator
Translate English, Spanish and German on your device. Keep SRT and VTT timing, edit the results and download.
German to English Translator
Translate German to English free on your device. Enter text or open SRT and VTT subtitles, keep timing, review and edit the English, then copy or save it.
Proofreader
Fix spelling, grammar and punctuation while keeping your meaning and voice. Review corrected text and a list of changes with your own OpenRouter key.
Company Info Finder
Find a business's name, address and contact details on its own site, with a source page for each fact. Runs on your own OpenRouter key.
Spreadsheet Cleaner
Trim, dedupe, fix dates and case, or split and merge columns in CSV and Excel files. Your file stays in your browser.
Data Finder
Describe your use case and get up to three matching data sources.
SEO Checker
Check a public page for SEO strengths and get fixes ranked by weight. Free fixed rules, with a copyable checklist.
Page Checker
Check whether a page really shows content. Find empty pages, error messages, unfinished copy and redirects to a home page.
Recall Check
Find U.S. CPSC recall notices that may match your product, brand, model or UPC. Read the notice.
Page to Markdown
Turn a public page URL into Markdown with headings, lists, tables and links.
Word counter
Count words, characters and paragraphs.
Character counter
Count characters and check common text limits.
JSON formatter and validator
Make JSON easier to read and check for errors.
HAR Viewer and Sanitizer
Open a HAR file in your browser to filter its requests, read headers and bodies, and see a timing waterfall. Save a copy without cookies and tokens.
Hex Viewer
Open any file in your browser as hex and text. Jump to an offset, search bytes or text, read values and see where the file is packed or empty.
APK Inspector
Open an Android APK in your browser to read its manifest, permissions by group, exported components, web addresses in its code and signer certificate.
Strings Extractor
Pull readable text out of any file in your browser, with offsets. Filter URLs, emails, file paths, IP addresses and keys, then copy or save the list.
Binary Inspector
Open a Windows EXE or DLL, Linux ELF or Mac Mach-O file in your browser. See its architecture, sections, imports and exports on a section size map.
HAR to OpenAPI Converter
Turn a HAR file into an OpenAPI 3.1 spec in your browser. See every endpoint on a tree, then copy or save the spec as YAML or JSON. Secrets are removed first.
ASAR Viewer
Open an Electron app.asar archive in your browser. Browse its files on a file size map, read the code, find web addresses and save one file.
.NET Assembly Viewer
Open a .NET DLL or EXE in your browser. See its version, references and every namespace, type and member on a type tree you can search.
Fancy font generator
Copy your text in different letter styles.
QR codes and barcodes
Barcode scanner
Read barcodes, GS1 product numbers, expiry dates and lots from a camera or photo.
Printable QR Code Maker
Make one print-ready PDF with QR signs, folding table tents, business cards and Avery labels.
QR code maker
Turn text, a link or Wi-Fi details into a QR code.
Barcode generator
Make a barcode and save it as an image.
Audio and video
Sound Effects Maker
Make retro coins, jumps, lasers and explosions for games and videos. Tweak settings and download WAV audio on your device.
Subtitle Generator
Turn video or audio into editable SRT, VTT and text subtitles with Whisper. Free, private, and entirely in your browser.
Text to Speech and Voiceover
Make natural English voiceovers with US or UK voices. Fix pronunciations and download WAV, MP3 or AAC/Opus privately.
Video Editor: Trim, Join and Resize
Join clips, trim moments and resize for Reels, TikTok and Shorts. Fit or Fill, keep sound or mute; nothing uploaded.
M4A to MP3 Converter
Convert M4A to MP3 for free in your browser. Save iPhone voice memos or iTunes audio, choose a bitrate and convert many files. Nothing is uploaded.
MOV to MP3 Converter
Convert MOV to MP3 for free in your browser. Pull sound from an iPhone or camera video, choose a bitrate and save audio in a batch. Nothing is uploaded.
MP4 to MP3 Converter
Convert MP4 to MP3 for free in your browser. Pull the sound from an MP4 video, choose a bitrate and save audio in a batch. Nothing is uploaded.
Compress Video Online
Compress video online for free, with no upload. Shrink MP4, MOV or WebM for email, choose a size or quality preset and save many videos privately.
MOV to MP4 Converter
Convert MOV to MP4 free with no upload. Copy H.264 or iPhone HEVC instantly without quality loss, or re-encode to H.264. Save many videos privately.
Photo Slideshow Maker
Animate photos with smooth Ken Burns zooms, pans, cross-fades and optional music. Export video on your device.
Screen recorder (free, no install)
Record your screen or a browser tab.
Voice recorder online
Record, play back and save your voice.
Mic test — check your microphone
Check your microphone level and hear a short test.
Webcam test — check your camera
Check your camera preview and take a picture.
Trim Video Online
Trim video online for free: cut the start and end of an MP4 or MOV in your browser. Keep the original size; nothing is uploaded.
GIF to MP4 converter
Convert GIF to MP4 free in your browser. Keep variable frame timing for one silent loop, choose a background for transparency and save a local video.
Everyday
Compress File Online
Bundle files or folders into a ZIP in your browser and compare sizes. No upload.
Password generator
Make a random password with the length you choose.
Typing test
Check your typing speed and accuracy.
Spin the wheel
Spin a wheel to pick from your list of choices.
Run Loop Maker
Plan a running route from your location or an address. Map loops within 3% of your distance, open Google Maps, save GPX or share a link. Free, no account.
BMI Calculator
Calculate adult BMI from weight and height in kg and metres or pounds and inches. See CDC weight categories and learn what BMI can and cannot tell you.
One-Rep Max Calculator
Estimate your one-rep max in kg or lb with Epley and Brzycki formulas. Compare both estimates and see a percentage table for sets of 1 to 12 reps.
Running Pace Calculator
Calculate running pace, time or distance in kilometres or miles. Use 5K to marathon presets and predict a race time with the Riegel formula, free online.
Run Goal Planner
See what share of runners finish slower than your 5K, 10K, half or marathon time, your level for your age and sex, and where 10 to 90-day goals take you.
Light Schedule Planner
Plan smart bulb brightness and colour temperature through the day. Drag a 24-hour curve, use local sunrise and sunset, and copy steps or automation YAML.
Calorie and Macro Calculator
Estimate daily calories with three resting-energy formulas and an activity factor. Turn an editable calorie target and macro split into daily grams.
Heart-Rate Zone Calculator
Calculate adult heart-rate zones with 220 minus age or Tanaka, a measured maximum override, and optional Karvonen heart-rate reserve. See AHA ranges in bpm.
Body Fat Calculator
Estimate adult body fat with the US Navy tape formula in inches or centimetres. Compare a separate BMI and age estimate, with formulas and primary sources.
Basement water cause finder
Narrow down possible basement water causes from safe observations, with first checks, trade referrals and cited sources.
Kitchen Remodel Cost Estimator
Estimate a kitchen remodel budget by size and scope, with separate national reference cards and dated sources.
Flooring Cost Calculator
Estimate flooring installation cost by room and material. Compare all eight installed ranges, with hardwood order guidance and dated sources.
Driveway Cost Calculator
Estimate driveway replacement cost by section and surface. Compare ten installed ranges with concrete removal, unpriced prep checks and dated sources.
Unix Epoch Converter
Convert a Unix timestamp to a date, or a date to a Unix timestamp, in seconds or milliseconds. Pick a time zone and see the current epoch tick. Runs in your browser.
Pole Barn Cost Calculator
Estimate pole barn cost by width and length. See construction and optional living-space build-out ranges, unpriced checks and dated references.
Water Softener Size Calculator
Estimate water softener grain capacity and yearly salt cost from tested hardness and household water use, with dated primary sources.
Yard Drainage Cause Finder
Find likely yard drainage causes to investigate, options and who does the work, with dated public agency planning estimates.
Funeral Cost Planner and Your Rights
Know your FTC Funeral Rule rights, see NFDA 2023 reference medians and add up your own itemized funeral prices, with missing prices visible.
EV Charger Installation Planner
Plan EV charger installation with exact circuit sizing, panel capacity questions, dated utility and DOE references, and federal credit rules.
Pickleball Court Cost and Size Planner
Check pickleball court footprints and yard fit, with separate public city cost references and unpriced scope.
Furnace Age Calculator
Decode confirmed furnace date formats, estimate age at a selected date and compare your repair and replacement quotes with sourced guidance.
Roof Replacement Cost Calculator
Calculate sloped roof area and roofing squares from footprint and pitch, with historical public bid estimates and separately sourced removal scenarios.
Fence Cost Calculator
Estimate fence and gate bounds from exact historical Sunrise municipal bid rates, with net length, gate widths and local permit guidance.
Wheelchair Ramp Calculator
Plan minimum ramp run from entrance rise using cited ADA dimensions, with separate historical accessibility cost cards.
Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers exactly. Get a simplified fraction, mixed number and decimal in your browser.
Decimal to Fraction
Convert terminating or repeating decimals into exact simplified fractions and mixed numbers. Mark repeating digits with parentheses or a bar.
Grade Calculator
Calculate a weighted course grade from category scores and weights, then find the final-exam score needed for a target percentage.
GPA Calculator
Calculate credit-weighted GPA on a 4.0 unweighted scale. Optionally add a common honors and AP weighting convention, with school differences explained.
Square Footage Calculator
Find square footage for rectangles, circles, triangles and L-shaped rooms. Sum multiple rooms and convert square feet and square metres.
Volume Calculator
Calculate volume for a cube, box, cylinder, cone, sphere or rectangular pyramid. See each formula and convert cubic feet, cubic metres and litres.
Concrete Calculator
Estimate concrete for slabs, footings, columns and solid steps in cubic yards and cubic metres. Add waste and compare 40, 60 and 80 lb bag counts.
Date Calculator
Count days between dates, including weekdays only, or add and subtract days, weeks, months and years with month-end clamping. Free in your browser.
Hours Calculator
Calculate hours from start and end clock times, overnight shifts and unpaid breaks. See decimal hours and H:MM together, free and private in your browser.
Time Card Calculator
Add a week of clock-time shifts with unpaid breaks and overnight hours. Get decimal and H:MM totals, with optional overtime past 40 hours. Free online.
Percentage Calculator
Calculate X percent of Y, X as a percentage of Y, or percentage change from X to Y. See formulas and worked examples, free and private in your browser.
Tip Calculator
Calculate a bill tip, split the total between people, and optionally round up each share to a whole dollar. See all rounding amounts, free in your browser.
Ratio Calculator
Simplify a decimal ratio A:B, solve A:B = C:?, or scale both terms to a target part or total. See the formulas and worked examples, free in your browser.
401(k) Retirement Calculator
Model a 401(k) balance from an entered balance, monthly contribution, fixed annual return and years. See modeled interest and yearly balances, free.
Compound Interest Calculator
Calculate compound interest with monthly or yearly contributions, deposit timing, APY and a year-by-year balance table. Free in your browser.
Investment Calculator
Calculate a future balance from principal, a fixed annual rate and recurring contributions. Compare deposit timing and view yearly totals in your browser.
CD Calculator
Calculate a CD balance and interest from principal, nominal annual rate, term and compounding frequency. See modeled APY and yearly balances, free.
Simple Interest Calculator
Calculate simple interest using principal, annual percentage rate and time in years. See interest earned, final balance and a yearly table, free.
Margin Calculator
Calculate cost, selling price, gross profit, margin and markup from two independent values. See the formulas and results, free in your browser.
Markup Calculator
Calculate selling price from cost and markup, or solve cost and margin from another pair of values. Free arithmetic with clear formulas in your browser.
Discount Calculator
Calculate a discounted price, stacked percentage discounts, amount saved and optional sales tax after discounts. Free and private in your browser.
Percent Off Calculator
Calculate percent off a price, savings and the final total with optional sales tax. Apply additional discounts in order, free in your browser.
GCF Calculator
Find the greatest common factor of 2 to 20 integers with exact arithmetic. See prime factorizations, a formula and a worked example in your browser.
LCM Calculator
Find the least common multiple of 2 to 20 integers with exact arithmetic. See each prime factorization, a formula and a worked example in your browser.
Prime Number Checker
Check whether an integer is prime with exact deterministic Miller–Rabin tests. Get a smallest factor or full factorization for smaller numbers, free.
Slope Calculator
Find slope, y-intercept, line equations, distance, midpoint and angle from two points. Handle vertical lines and view the formula in your browser.
Pythagorean Theorem Calculator
Find a missing right triangle side from any two sides using the Pythagorean theorem. Calculate both acute angles and area with a formula and example.
Average Calculator
Calculate average, median, mode, range, sum, count and both standard deviations. Add optional weights for a weighted average, free in your browser.
TDEE Calculator
Estimate TDEE from an activity factor and adult measurements. See daily and resting calories with three formulas, sources and a worked example.
BMR Calculator
Estimate BMR from adult weight, height and age with Mifflin–St Jeor or two other resting-energy formulas. See kcal per day, sources and an example.
Cylinder Volume Calculator
Calculate cylinder volume from radius and height in matching units. Convert cubic feet, cubic metres and litres with a formula and worked example.
Percentage Increase Calculator
Find percentage increase or decrease from an original value to a new value. See signed change, the formula and a worked example in your browser.
Proportion Calculator
Solve a missing proportion term in A:B = C:?. Enter three known values and get the fourth with equivalent ratios, a formula and a worked example.
Final Exam Calculator
Calculate the final exam score needed for your target course grade. Enter current categories and final weight to see the required percentage and formula.
Gravel Calculator
Calculate gravel volume for a rectangle, circle or total area and depth in inches. See cubic yards, cubic metres and tons with editable density.
Mulch Calculator
Calculate mulch volume from a rectangle, circle or total area and depth in inches. See cubic yards, cubic metres and 2 cu ft or 3 cu ft bag counts.
Inflation Calculator
Compare US dollar purchasing power across months or annual averages from 1913 with published BLS CPI-U.
Quarts to Cups Converter
Convert US liquid quarts to US customary cups or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Gallons to Liters Converter
Convert US liquid gallons to liters or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Ounces to Grams Converter
Convert avoirdupois ounces (mass) to grams or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Fluid Ounces to Cups Converter
Convert US fluid ounces to US customary cups or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Tablespoons to Cups Converter
Convert US tablespoons to US customary cups or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Fluid Ounces to Milliliters Converter
Convert US fluid ounces to milliliters or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Milliliters to Liters Converter
Convert milliliters to liters or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Pounds to Ounces Converter
Convert avoirdupois pounds to mass ounces or reverse. Enter decimals or fractions and see a common-value table and worked example. Free in your browser.
Teaspoons to Tablespoons Converter
Convert US teaspoons to US tablespoons or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Scientific Calculator
Evaluate arithmetic, powers, roots, logs and trigonometric functions with parentheses. Choose degrees or radians and get finite real results in your browser.
Quadratic Formula Calculator
Solve ax² + bx + c = 0 from entered coefficients. See real or complex roots, the discriminant and linear or constant cases, free in your browser.
Salary to Hourly Calculator
Convert gross annual salary to hourly pay or hourly pay to annual salary using your entered weekly hours and paid weeks. Free arithmetic in your browser.
Long Division Calculator
Divide decimal strings exactly with long division steps, an integer quotient and remainder. See terminating, repeating or truncated decimals in your browser.
Scientific Notation Calculator
Normalize decimal strings to scientific notation or expand exponent notation exactly. Keep all entered numerical digits without binary float conversion.
Rounding Calculator
Round decimal strings exactly to decimal places, tens, hundreds or other powers of ten. Choose half away from zero or half even, including negative ties.
Age Difference Calculator
Calculate years, months, days and total days between two birth dates. Use explicit Gregorian dates and a stated month-end convention, free in your browser.
Julian Date Converter
Convert explicit UTC civil timestamps to Julian day and back using the proleptic Gregorian calendar. See the noon epoch, time-scale convention and ordinal day.
Area Calculator
Calculate rectangle, circle, triangle and L-shaped areas. Sum separate shapes and see your selected square units first, with formulas and examples.
Cubic Feet Calculator
Find cubic feet from box dimensions in feet or inches. Also calculate cylinders, cones and other solids, with cubic metres and litres alongside the result.
Standard Deviation Calculator
Calculate sample and population standard deviation from a list of numbers. See both deviations first with mean, count, formulas and a worked example.
Distance Formula Calculator
Find straight-line distance between two distinct points in a plane. Enter coordinates in one unit and see distance first, with midpoint and line details.
Future Value Calculator
Calculate future value from principal, a fixed nominal rate and term. Add optional recurring contributions and see deposits, interest and yearly balances.
APY Calculator
Convert a nominal annual interest rate and compounding frequency to modeled APY. See the effective annual yield first, with formula and a one-year example.
Savings Calculator
Model savings growth with an initial balance, recurring deposits and an entered fixed interest rate. See total deposits, interest and a yearly balance table.
Business Day Calculator
Count Monday–Friday weekdays between two dates, with inclusive or exclusive endpoints. Weekends are excluded; public holidays stay included. Free and private.
Centimeters to Meters Converter
Convert centimeters to meters or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Feet to Centimeters Converter
Convert international feet to centimeters or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Feet to Yards Converter
Convert international feet to international yards or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Knots to MPH Converter
Convert knots to international miles per hour or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Inches to Meters Converter
Convert international inches to meters or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Grams to Cups Converter
Convert grams to US customary cups or reverse using your entered density in g/mL. See the formula and examples. Free and private in your browser.
Board Foot Calculator
Sum board feet for multiple lumber sizes and whole piece counts, with optional entered prices. Inch/foot or metric dimensions. Free in your browser.
Paint Calculator
Calculate paint volume and whole containers from surface area, openings, coats and entered coverage. Use square feet or meters. Free in your browser.
Fuel Cost Calculator
Calculate trip fuel and cost from entered distance, economy and fuel price. US mpg, L/100 km and km/L supported. Free and private in your browser.
Unit Price Calculator
Compare package prices per equal mass, volume or whole item count in one entered currency. Mixed compatible units supported. Free in your browser.
Car Loan Calculator
Calculate fixed-rate car loan payments from price, down payment, entered rate and months. See financed principal, total interest and monthly balances.
Loan Payment Calculator
Compute monthly principal and interest for a fixed-rate loan, including zero rates, extra payments, total interest and a full monthly schedule.
Mortgage Payment Calculator
Compute fixed-rate mortgage principal and interest from price, down payment, rate and months. Taxes, insurance, PMI and fees are not included.
Auto Loan Payoff Calculator
Model an auto loan remaining balance with extra monthly payments. Compute payoff month, total interest and the final payment from your entered rate and term.
Amortization Schedule Calculator
Build a fixed-rate monthly amortization table with payment, principal, interest and balance. Totals reconcile to principal plus total interest.
Auto Loan Amortization Calculator
Generate an auto loan amortization table from price, down payment, fixed rate and months. See principal reduction, interest and each remaining balance.
Exponent Calculator
Free exponent calculator: raise a number to a power and get the exact result, with the formula under the answer and a clear error when no real answer exists.
Logarithm Calculator
Free log calculator: find the logarithm of a positive number in base 10, base e or any base you enter. Shows the change-of-base formula and an example.
Square Root Simplifier
Free square root simplifier: rewrite the square root of a whole number up to one trillion in simplest radical form a√b, using exact whole-number factors.
Z Score Calculator
Free z-score calculator: enter a value, the mean and the standard deviation to see how many standard deviations it sits from the mean, with the formula.
Combination Calculator
Free combination calculator: count exact combinations (nCr) and permutations (nPr) for whole numbers, with the formula and a worked example under the result.
ROI Calculator
Free ROI calculator: enter what you paid and what it is worth now to see net gain and return on investment as a percent, with optional yearly return.
Centimeters to Millimeters Converter
Convert centimeters to millimeters or back: 1 cm equals exactly 10 mm. Includes a common-values table and a worked example. Free in your browser.
Centimeters to Inches Converter
Convert centimeters to international inches or reverse, with a common-values table and worked example. Free in your browser.
Grams to Kilograms Converter
Convert grams to kilograms or back: 1,000 grams equal exactly 1 kilogram. Includes a common-values table and a worked example. Free in your browser.
Inches to Feet Converter
Convert international inches to international feet or reverse, with a common-values table and worked example. Free in your browser.
Kilograms to Pounds Converter
Convert kilograms to avoirdupois pounds or reverse, with a common-values table and worked example. Free in your browser.
Mean Calculator
Calculate the arithmetic mean of a list of values, with median, mode, range, sum, count and standard deviations. Free in your browser.
Millimeters to Inches Converter
Convert millimeters to international inches or reverse, with a common-values table and worked example. Free in your browser.
Ounces to Pounds Converter
Convert avoirdupois ounces to pounds or reverse. Mass units are explicit; fluid ounces are a volume unit. Free in your browser.
Retirement Income Calculator
Calculate a level withdrawal, total withdrawn and a bounded period table from an entered balance and fixed return.
Debt-to-Income Ratio Calculator
Sum entered monthly debt payments and divide by gross monthly income to show the ratio percentage.
Decimal to Hex Converter
Convert a nonnegative decimal integer to hexadecimal in your browser. See the place-value steps and a worked example.
Hex to Binary Converter
Convert hexadecimal digits to binary in your browser. Each hex digit maps to four binary bits.
Binary to Hex Converter
Convert binary digits to hexadecimal in your browser. Group bits by four from the right.
Hex to Decimal Converter
Convert hexadecimal integers to decimal in your browser with a place-value breakdown.
Binary to Decimal Converter
Convert binary integers to decimal in your browser. Unsigned is the default; optional signed reading uses a required bit width.
Roman Numeral Converter
Convert whole numbers from 1 to 3999 to canonical Roman numerals, or check and convert canonical Roman numerals.
Significant Figures Converter
Round a decimal string to a chosen number of significant figures with exact half-up rounding and preserved trailing zeros.
Career and money
Subscription Finder
Find recurring payments in bank or card exports, track yearly costs and estimate cancellation savings. Your files stay in your browser.
Résumé vs job description
See which skills a job description names that your résumé shows and doesn't show.
Auction Organizer
Organize eBay links, track bids and wins, and download calendar reminders. You bid yourself on eBay.
BAH vs house payment
Compare your housing allowance with a house payment and local rent.
Free invoice generator (PDF)
Fill in your details and save an invoice as a PDF.
Receipt & Invoice Scanner
Read receipt photos or invoice PDFs into editable tables, CSV and Excel. Confirm every field privately in your browser.
Will Checklist and Trust Guide
General information about wills and trusts, with a private list of facts and papers to bring to a lawyer.
AI Image Upscaler
Enlarge pictures 2x or 4x with a small AI model on your device. Keep transparency and download PNG, JPG or WebP.
Product Photo Background Remover
Cut out a product in your browser. Download transparent PNG or add a white or custom colour background.
Image to SVG Tracer
Turn logos, drawings and photos into SVG vector paths. Trace colours and remove backgrounds in your browser.
Image compressor
Make JPEG, PNG and WebP images smaller on your device.
Image converter: WebP to PNG, PNG to JPG
Change images to JPG, PNG or WebP.
PNG to JPG Converter
Convert a PNG file to JPG free in your browser. JPEG is selected by default; adjust quality, turn transparent areas white and save each image. No uploads.
WebP to JPG converter
Turn WebP images into JPG files, many at once.
Image to Text
Read photos, screenshots and scans into editable text in six languages. Your images stay in your browser.
Image resizer
Change image size by width, height or percentage.
Flip Image
Flip an image horizontally or vertically for free. Mirror a batch of JPG, PNG or WebP files in your browser and save each one in its original format. Nothing is uploaded.
GIF maker
Turn images or a short video into a GIF.
MP4 to Animated GIF
Convert MP4 to animated GIF free from a local file. Choose a clip, size, frame rate and looping in your browser. No upload; up to 15 seconds and 150 frames.
Compress PDF
Shrink PDF images privately, with selectable text or smaller image pages.
Free PDF Editor Online
Edit a PDF free online: add text, white-out, images and signatures, then rotate or rearrange pages. Files stay in your browser, with no upload or sign up.
EPUB to PDF Converter
Convert EPUB books to PDF privately in your browser, with page sizes, images and a table of contents.
PDF merger
Put several PDFs together in the order you choose.
JPG to PDF converter
Put images together in one PDF.
PNG to PDF Converter
Convert PNG to PDF free in your browser. Order your PNG images, choose Fit image, A4 or Letter and margins, then save one PDF. No upload or sign up.
Fillable PDF Form Builder
Open a PDF or start blank, place form fields, and download a fillable PDF. Your PDF stays in this browser.
PDF to Word and Excel
Convert text PDFs into editable text and tables. Preview and download Word or Excel files in your browser.
PDF to JPG converter
Turn PDF pages into JPG or PNG images.
PDF to PNG Converter
Convert PDF to PNG free in your browser. Choose page ranges and image scale, then save lossless PNG page images individually or in a ZIP. Nothing is uploaded.
APA Citation Generator
Format APA 7 references, build an alphabetical reference list and export Word with italics and hanging indents.
Text and Subtitle Translator
Translate English, Spanish and German on your device. Keep SRT and VTT timing, edit the results and download.
German to English Translator
Translate German to English free on your device. Enter text or open SRT and VTT subtitles, keep timing, review and edit the English, then copy or save it.
Proofreader
Fix spelling, grammar and punctuation while keeping your meaning and voice. Review corrected text and a list of changes with your own OpenRouter key.
Company Info Finder
Find a business's name, address and contact details on its own site, with a source page for each fact. Runs on your own OpenRouter key.
Spreadsheet Cleaner
Trim, dedupe, fix dates and case, or split and merge columns in CSV and Excel files. Your file stays in your browser.
Data Finder
Describe your use case and get up to three matching data sources.
SEO Checker
Check a public page for SEO strengths and get fixes ranked by weight. Free fixed rules, with a copyable checklist.
Page Checker
Check whether a page really shows content. Find empty pages, error messages, unfinished copy and redirects to a home page.
Recall Check
Find U.S. CPSC recall notices that may match your product, brand, model or UPC. Read the notice.
Page to Markdown
Turn a public page URL into Markdown with headings, lists, tables and links.
Word counter
Count words, characters and paragraphs.
Character counter
Count characters and check common text limits.
JSON formatter and validator
Make JSON easier to read and check for errors.
HAR Viewer and Sanitizer
Open a HAR file in your browser to filter its requests, read headers and bodies, and see a timing waterfall. Save a copy without cookies and tokens.
Hex Viewer
Open any file in your browser as hex and text. Jump to an offset, search bytes or text, read values and see where the file is packed or empty.
APK Inspector
Open an Android APK in your browser to read its manifest, permissions by group, exported components, web addresses in its code and signer certificate.
Strings Extractor
Pull readable text out of any file in your browser, with offsets. Filter URLs, emails, file paths, IP addresses and keys, then copy or save the list.
Binary Inspector
Open a Windows EXE or DLL, Linux ELF or Mac Mach-O file in your browser. See its architecture, sections, imports and exports on a section size map.
HAR to OpenAPI Converter
Turn a HAR file into an OpenAPI 3.1 spec in your browser. See every endpoint on a tree, then copy or save the spec as YAML or JSON. Secrets are removed first.
ASAR Viewer
Open an Electron app.asar archive in your browser. Browse its files on a file size map, read the code, find web addresses and save one file.
.NET Assembly Viewer
Open a .NET DLL or EXE in your browser. See its version, references and every namespace, type and member on a type tree you can search.
Fancy font generator
Copy your text in different letter styles.
Barcode scanner
Read barcodes, GS1 product numbers, expiry dates and lots from a camera or photo.
Printable QR Code Maker
Make one print-ready PDF with QR signs, folding table tents, business cards and Avery labels.
QR code maker
Turn text, a link or Wi-Fi details into a QR code.
Barcode generator
Make a barcode and save it as an image.
Sound Effects Maker
Make retro coins, jumps, lasers and explosions for games and videos. Tweak settings and download WAV audio on your device.
Subtitle Generator
Turn video or audio into editable SRT, VTT and text subtitles with Whisper. Free, private, and entirely in your browser.
Text to Speech and Voiceover
Make natural English voiceovers with US or UK voices. Fix pronunciations and download WAV, MP3 or AAC/Opus privately.
Video Editor: Trim, Join and Resize
Join clips, trim moments and resize for Reels, TikTok and Shorts. Fit or Fill, keep sound or mute; nothing uploaded.
M4A to MP3 Converter
Convert M4A to MP3 for free in your browser. Save iPhone voice memos or iTunes audio, choose a bitrate and convert many files. Nothing is uploaded.
MOV to MP3 Converter
Convert MOV to MP3 for free in your browser. Pull sound from an iPhone or camera video, choose a bitrate and save audio in a batch. Nothing is uploaded.
MP4 to MP3 Converter
Convert MP4 to MP3 for free in your browser. Pull the sound from an MP4 video, choose a bitrate and save audio in a batch. Nothing is uploaded.
Compress Video Online
Compress video online for free, with no upload. Shrink MP4, MOV or WebM for email, choose a size or quality preset and save many videos privately.
MOV to MP4 Converter
Convert MOV to MP4 free with no upload. Copy H.264 or iPhone HEVC instantly without quality loss, or re-encode to H.264. Save many videos privately.
Photo Slideshow Maker
Animate photos with smooth Ken Burns zooms, pans, cross-fades and optional music. Export video on your device.
Screen recorder (free, no install)
Record your screen or a browser tab.
Voice recorder online
Record, play back and save your voice.
Mic test — check your microphone
Check your microphone level and hear a short test.
Webcam test — check your camera
Check your camera preview and take a picture.
Compress File Online
Bundle files or folders into a ZIP in your browser and compare sizes. No upload.
Password generator
Make a random password with the length you choose.
Typing test
Check your typing speed and accuracy.
Spin the wheel
Spin a wheel to pick from your list of choices.
Subscription Finder
Find recurring payments in bank or card exports, track yearly costs and estimate cancellation savings. Your files stay in your browser.
Résumé vs job description
See which skills a job description names that your résumé shows and doesn't show.
Auction Organizer
Organize eBay links, track bids and wins, and download calendar reminders. You bid yourself on eBay.
BAH vs house payment
Compare your housing allowance with a house payment and local rent.
Free invoice generator (PDF)
Fill in your details and save an invoice as a PDF.
Receipt & Invoice Scanner
Read receipt photos or invoice PDFs into editable tables, CSV and Excel. Confirm every field privately in your browser.
YouTube to transcript
Read public YouTube captions as timestamped text.
Discord Event Scheduler
A Discord bot that finds the night your D&D group can all play.
Will Checklist and Trust Guide
General information about wills and trusts, with a private list of facts and papers to bring to a lawyer.
Run Loop Maker
Plan a running route from your location or an address. Map loops within 3% of your distance, open Google Maps, save GPX or share a link. Free, no account.
BMI Calculator
Calculate adult BMI from weight and height in kg and metres or pounds and inches. See CDC weight categories and learn what BMI can and cannot tell you.
One-Rep Max Calculator
Estimate your one-rep max in kg or lb with Epley and Brzycki formulas. Compare both estimates and see a percentage table for sets of 1 to 12 reps.
Running Pace Calculator
Calculate running pace, time or distance in kilometres or miles. Use 5K to marathon presets and predict a race time with the Riegel formula, free online.
Run Goal Planner
See what share of runners finish slower than your 5K, 10K, half or marathon time, your level for your age and sex, and where 10 to 90-day goals take you.
Light Schedule Planner
Plan smart bulb brightness and colour temperature through the day. Drag a 24-hour curve, use local sunrise and sunset, and copy steps or automation YAML.
Calorie and Macro Calculator
Estimate daily calories with three resting-energy formulas and an activity factor. Turn an editable calorie target and macro split into daily grams.
Heart-Rate Zone Calculator
Calculate adult heart-rate zones with 220 minus age or Tanaka, a measured maximum override, and optional Karvonen heart-rate reserve. See AHA ranges in bpm.
Body Fat Calculator
Estimate adult body fat with the US Navy tape formula in inches or centimetres. Compare a separate BMI and age estimate, with formulas and primary sources.
Basement water cause finder
Narrow down possible basement water causes from safe observations, with first checks, trade referrals and cited sources.
Kitchen Remodel Cost Estimator
Estimate a kitchen remodel budget by size and scope, with separate national reference cards and dated sources.
Flooring Cost Calculator
Estimate flooring installation cost by room and material. Compare all eight installed ranges, with hardwood order guidance and dated sources.
Driveway Cost Calculator
Estimate driveway replacement cost by section and surface. Compare ten installed ranges with concrete removal, unpriced prep checks and dated sources.
Unix Epoch Converter
Convert a Unix timestamp to a date, or a date to a Unix timestamp, in seconds or milliseconds. Pick a time zone and see the current epoch tick. Runs in your browser.
Pole Barn Cost Calculator
Estimate pole barn cost by width and length. See construction and optional living-space build-out ranges, unpriced checks and dated references.
Water Softener Size Calculator
Estimate water softener grain capacity and yearly salt cost from tested hardness and household water use, with dated primary sources.
Yard Drainage Cause Finder
Find likely yard drainage causes to investigate, options and who does the work, with dated public agency planning estimates.
Funeral Cost Planner and Your Rights
Know your FTC Funeral Rule rights, see NFDA 2023 reference medians and add up your own itemized funeral prices, with missing prices visible.
EV Charger Installation Planner
Plan EV charger installation with exact circuit sizing, panel capacity questions, dated utility and DOE references, and federal credit rules.
Pickleball Court Cost and Size Planner
Check pickleball court footprints and yard fit, with separate public city cost references and unpriced scope.
Trim Video Online
Trim video online for free: cut the start and end of an MP4 or MOV in your browser. Keep the original size; nothing is uploaded.
Redact PDF
Redact a PDF for real: draw boxes or find text, and covered pages become pictures so the hidden text is gone. No upload.
Word to PDF
Convert a Word .docx to PDF in your browser. Preview it, then save a PDF with selectable text. No upload; complex layouts may shift.
Sign PDF
Sign a PDF in your browser: draw, type or upload your signature, place it with a date and initials, and save. No upload.
GIF resizer
Resize an animated GIF in your browser for free. Change width and height, keep frame timing and download a resized GIF. No upload or sign up.
GIF to MP4 converter
Convert GIF to MP4 free in your browser. Keep variable frame timing for one silent loop, choose a background for transparency and save a local video.
WebP to GIF converter
Convert static or animated WebP to GIF free in your browser. Keep all animation frames and their timing, choose a size and download. Nothing is uploaded.
Animated GIF cropper
Crop an animated GIF online free. Drag a rectangle over the animation or enter exact pixels, then save a cropped GIF with frame timing kept. No upload.
Photo Collage Maker
Combine 2–9 photos in a grid or featured layout. Adjust gaps and background colour, then save PNG or JPEG in your browser.
PDF Splitter
Extract PDF page ranges into one PDF, or save one PDF per page in a ZIP. Text stays selectable. Nothing is uploaded.
HTML to PDF
Paste HTML or open a local HTML file, preview a printable document and choose Save as PDF in your browser.
Markdown to PDF
Turn Markdown headings, lists, tables and code blocks into a printable document. Preview locally and choose Save as PDF.
Furnace Age Calculator
Decode confirmed furnace date formats, estimate age at a selected date and compare your repair and replacement quotes with sourced guidance.
Roof Replacement Cost Calculator
Calculate sloped roof area and roofing squares from footprint and pitch, with historical public bid estimates and separately sourced removal scenarios.
Fence Cost Calculator
Estimate fence and gate bounds from exact historical Sunrise municipal bid rates, with net length, gate widths and local permit guidance.
Wheelchair Ramp Calculator
Plan minimum ramp run from entrance rise using cited ADA dimensions, with separate historical accessibility cost cards.
Crop PDF
Trim PDF margins with page previews and selected page ranges. Text stays selectable; cropping hides content without deleting it. Nothing is uploaded.
PDF to Text
Extract selectable PDF text in your browser. Copy or save a text file with page breaks kept; scanned PDFs need an existing text layer.
Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers exactly. Get a simplified fraction, mixed number and decimal in your browser.
Decimal to Fraction
Convert terminating or repeating decimals into exact simplified fractions and mixed numbers. Mark repeating digits with parentheses or a bar.
Grade Calculator
Calculate a weighted course grade from category scores and weights, then find the final-exam score needed for a target percentage.
GPA Calculator
Calculate credit-weighted GPA on a 4.0 unweighted scale. Optionally add a common honors and AP weighting convention, with school differences explained.
Square Footage Calculator
Find square footage for rectangles, circles, triangles and L-shaped rooms. Sum multiple rooms and convert square feet and square metres.
Volume Calculator
Calculate volume for a cube, box, cylinder, cone, sphere or rectangular pyramid. See each formula and convert cubic feet, cubic metres and litres.
Concrete Calculator
Estimate concrete for slabs, footings, columns and solid steps in cubic yards and cubic metres. Add waste and compare 40, 60 and 80 lb bag counts.
Date Calculator
Count days between dates, including weekdays only, or add and subtract days, weeks, months and years with month-end clamping. Free in your browser.
Hours Calculator
Calculate hours from start and end clock times, overnight shifts and unpaid breaks. See decimal hours and H:MM together, free and private in your browser.
Time Card Calculator
Add a week of clock-time shifts with unpaid breaks and overnight hours. Get decimal and H:MM totals, with optional overtime past 40 hours. Free online.
Percentage Calculator
Calculate X percent of Y, X as a percentage of Y, or percentage change from X to Y. See formulas and worked examples, free and private in your browser.
Tip Calculator
Calculate a bill tip, split the total between people, and optionally round up each share to a whole dollar. See all rounding amounts, free in your browser.
Ratio Calculator
Simplify a decimal ratio A:B, solve A:B = C:?, or scale both terms to a target part or total. See the formulas and worked examples, free in your browser.
401(k) Retirement Calculator
Model a 401(k) balance from an entered balance, monthly contribution, fixed annual return and years. See modeled interest and yearly balances, free.
Compound Interest Calculator
Calculate compound interest with monthly or yearly contributions, deposit timing, APY and a year-by-year balance table. Free in your browser.
Investment Calculator
Calculate a future balance from principal, a fixed annual rate and recurring contributions. Compare deposit timing and view yearly totals in your browser.
CD Calculator
Calculate a CD balance and interest from principal, nominal annual rate, term and compounding frequency. See modeled APY and yearly balances, free.
Simple Interest Calculator
Calculate simple interest using principal, annual percentage rate and time in years. See interest earned, final balance and a yearly table, free.
Margin Calculator
Calculate cost, selling price, gross profit, margin and markup from two independent values. See the formulas and results, free in your browser.
Markup Calculator
Calculate selling price from cost and markup, or solve cost and margin from another pair of values. Free arithmetic with clear formulas in your browser.
Discount Calculator
Calculate a discounted price, stacked percentage discounts, amount saved and optional sales tax after discounts. Free and private in your browser.
Percent Off Calculator
Calculate percent off a price, savings and the final total with optional sales tax. Apply additional discounts in order, free in your browser.
GCF Calculator
Find the greatest common factor of 2 to 20 integers with exact arithmetic. See prime factorizations, a formula and a worked example in your browser.
LCM Calculator
Find the least common multiple of 2 to 20 integers with exact arithmetic. See each prime factorization, a formula and a worked example in your browser.
Prime Number Checker
Check whether an integer is prime with exact deterministic Miller–Rabin tests. Get a smallest factor or full factorization for smaller numbers, free.
Slope Calculator
Find slope, y-intercept, line equations, distance, midpoint and angle from two points. Handle vertical lines and view the formula in your browser.
Pythagorean Theorem Calculator
Find a missing right triangle side from any two sides using the Pythagorean theorem. Calculate both acute angles and area with a formula and example.
Average Calculator
Calculate average, median, mode, range, sum, count and both standard deviations. Add optional weights for a weighted average, free in your browser.
TDEE Calculator
Estimate TDEE from an activity factor and adult measurements. See daily and resting calories with three formulas, sources and a worked example.
BMR Calculator
Estimate BMR from adult weight, height and age with Mifflin–St Jeor or two other resting-energy formulas. See kcal per day, sources and an example.
Cylinder Volume Calculator
Calculate cylinder volume from radius and height in matching units. Convert cubic feet, cubic metres and litres with a formula and worked example.
Percentage Increase Calculator
Find percentage increase or decrease from an original value to a new value. See signed change, the formula and a worked example in your browser.
Proportion Calculator
Solve a missing proportion term in A:B = C:?. Enter three known values and get the fourth with equivalent ratios, a formula and a worked example.
Final Exam Calculator
Calculate the final exam score needed for your target course grade. Enter current categories and final weight to see the required percentage and formula.
Gravel Calculator
Calculate gravel volume for a rectangle, circle or total area and depth in inches. See cubic yards, cubic metres and tons with editable density.
Mulch Calculator
Calculate mulch volume from a rectangle, circle or total area and depth in inches. See cubic yards, cubic metres and 2 cu ft or 3 cu ft bag counts.
Inflation Calculator
Compare US dollar purchasing power across months or annual averages from 1913 with published BLS CPI-U.
Quarts to Cups Converter
Convert US liquid quarts to US customary cups or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Gallons to Liters Converter
Convert US liquid gallons to liters or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Ounces to Grams Converter
Convert avoirdupois ounces (mass) to grams or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Fluid Ounces to Cups Converter
Convert US fluid ounces to US customary cups or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Tablespoons to Cups Converter
Convert US tablespoons to US customary cups or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Fluid Ounces to Milliliters Converter
Convert US fluid ounces to milliliters or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Milliliters to Liters Converter
Convert milliliters to liters or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Pounds to Ounces Converter
Convert avoirdupois pounds to mass ounces or reverse. Enter decimals or fractions and see a common-value table and worked example. Free in your browser.
Teaspoons to Tablespoons Converter
Convert US teaspoons to US tablespoons or reverse, with decimal and fraction inputs, a conversion table and worked example. Free in your browser.
Scientific Calculator
Evaluate arithmetic, powers, roots, logs and trigonometric functions with parentheses. Choose degrees or radians and get finite real results in your browser.
Quadratic Formula Calculator
Solve ax² + bx + c = 0 from entered coefficients. See real or complex roots, the discriminant and linear or constant cases, free in your browser.
Salary to Hourly Calculator
Convert gross annual salary to hourly pay or hourly pay to annual salary using your entered weekly hours and paid weeks. Free arithmetic in your browser.
Long Division Calculator
Divide decimal strings exactly with long division steps, an integer quotient and remainder. See terminating, repeating or truncated decimals in your browser.
Scientific Notation Calculator
Normalize decimal strings to scientific notation or expand exponent notation exactly. Keep all entered numerical digits without binary float conversion.
Rounding Calculator
Round decimal strings exactly to decimal places, tens, hundreds or other powers of ten. Choose half away from zero or half even, including negative ties.
Age Difference Calculator
Calculate years, months, days and total days between two birth dates. Use explicit Gregorian dates and a stated month-end convention, free in your browser.
Julian Date Converter
Convert explicit UTC civil timestamps to Julian day and back using the proleptic Gregorian calendar. See the noon epoch, time-scale convention and ordinal day.
Area Calculator
Calculate rectangle, circle, triangle and L-shaped areas. Sum separate shapes and see your selected square units first, with formulas and examples.
Cubic Feet Calculator
Find cubic feet from box dimensions in feet or inches. Also calculate cylinders, cones and other solids, with cubic metres and litres alongside the result.
Standard Deviation Calculator
Calculate sample and population standard deviation from a list of numbers. See both deviations first with mean, count, formulas and a worked example.
Distance Formula Calculator
Find straight-line distance between two distinct points in a plane. Enter coordinates in one unit and see distance first, with midpoint and line details.
Future Value Calculator
Calculate future value from principal, a fixed nominal rate and term. Add optional recurring contributions and see deposits, interest and yearly balances.
APY Calculator
Convert a nominal annual interest rate and compounding frequency to modeled APY. See the effective annual yield first, with formula and a one-year example.
Savings Calculator
Model savings growth with an initial balance, recurring deposits and an entered fixed interest rate. See total deposits, interest and a yearly balance table.
Business Day Calculator
Count Monday–Friday weekdays between two dates, with inclusive or exclusive endpoints. Weekends are excluded; public holidays stay included. Free and private.
Centimeters to Meters Converter
Convert centimeters to meters or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Feet to Centimeters Converter
Convert international feet to centimeters or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Feet to Yards Converter
Convert international feet to international yards or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Knots to MPH Converter
Convert knots to international miles per hour or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Inches to Meters Converter
Convert international inches to meters or reverse, with decimal and fraction inputs, a common-value table and worked examples. Free in your browser.
Grams to Cups Converter
Convert grams to US customary cups or reverse using your entered density in g/mL. See the formula and examples. Free and private in your browser.
Board Foot Calculator
Sum board feet for multiple lumber sizes and whole piece counts, with optional entered prices. Inch/foot or metric dimensions. Free in your browser.
Paint Calculator
Calculate paint volume and whole containers from surface area, openings, coats and entered coverage. Use square feet or meters. Free in your browser.
Fuel Cost Calculator
Calculate trip fuel and cost from entered distance, economy and fuel price. US mpg, L/100 km and km/L supported. Free and private in your browser.
Unit Price Calculator
Compare package prices per equal mass, volume or whole item count in one entered currency. Mixed compatible units supported. Free in your browser.
Car Loan Calculator
Calculate fixed-rate car loan payments from price, down payment, entered rate and months. See financed principal, total interest and monthly balances.
Loan Payment Calculator
Compute monthly principal and interest for a fixed-rate loan, including zero rates, extra payments, total interest and a full monthly schedule.
Mortgage Payment Calculator
Compute fixed-rate mortgage principal and interest from price, down payment, rate and months. Taxes, insurance, PMI and fees are not included.
Auto Loan Payoff Calculator
Model an auto loan remaining balance with extra monthly payments. Compute payoff month, total interest and the final payment from your entered rate and term.
Amortization Schedule Calculator
Build a fixed-rate monthly amortization table with payment, principal, interest and balance. Totals reconcile to principal plus total interest.
Auto Loan Amortization Calculator
Generate an auto loan amortization table from price, down payment, fixed rate and months. See principal reduction, interest and each remaining balance.
Exponent Calculator
Free exponent calculator: raise a number to a power and get the exact result, with the formula under the answer and a clear error when no real answer exists.
Logarithm Calculator
Free log calculator: find the logarithm of a positive number in base 10, base e or any base you enter. Shows the change-of-base formula and an example.
Square Root Simplifier
Free square root simplifier: rewrite the square root of a whole number up to one trillion in simplest radical form a√b, using exact whole-number factors.
Z Score Calculator
Free z-score calculator: enter a value, the mean and the standard deviation to see how many standard deviations it sits from the mean, with the formula.
Combination Calculator
Free combination calculator: count exact combinations (nCr) and permutations (nPr) for whole numbers, with the formula and a worked example under the result.
ROI Calculator
Free ROI calculator: enter what you paid and what it is worth now to see net gain and return on investment as a percent, with optional yearly return.
Centimeters to Millimeters Converter
Convert centimeters to millimeters or back: 1 cm equals exactly 10 mm. Includes a common-values table and a worked example. Free in your browser.
Centimeters to Inches Converter
Convert centimeters to international inches or reverse, with a common-values table and worked example. Free in your browser.
Grams to Kilograms Converter
Convert grams to kilograms or back: 1,000 grams equal exactly 1 kilogram. Includes a common-values table and a worked example. Free in your browser.
Inches to Feet Converter
Convert international inches to international feet or reverse, with a common-values table and worked example. Free in your browser.
Kilograms to Pounds Converter
Convert kilograms to avoirdupois pounds or reverse, with a common-values table and worked example. Free in your browser.
Mean Calculator
Calculate the arithmetic mean of a list of values, with median, mode, range, sum, count and standard deviations. Free in your browser.
Millimeters to Inches Converter
Convert millimeters to international inches or reverse, with a common-values table and worked example. Free in your browser.
Ounces to Pounds Converter
Convert avoirdupois ounces to pounds or reverse. Mass units are explicit; fluid ounces are a volume unit. Free in your browser.
Retirement Income Calculator
Calculate a level withdrawal, total withdrawn and a bounded period table from an entered balance and fixed return.
Debt-to-Income Ratio Calculator
Sum entered monthly debt payments and divide by gross monthly income to show the ratio percentage.
Decimal to Hex Converter
Convert a nonnegative decimal integer to hexadecimal in your browser. See the place-value steps and a worked example.
Hex to Binary Converter
Convert hexadecimal digits to binary in your browser. Each hex digit maps to four binary bits.
Binary to Hex Converter
Convert binary digits to hexadecimal in your browser. Group bits by four from the right.
Hex to Decimal Converter
Convert hexadecimal integers to decimal in your browser with a place-value breakdown.
Binary to Decimal Converter
Convert binary integers to decimal in your browser. Unsigned is the default; optional signed reading uses a required bit width.
Roman Numeral Converter
Convert whole numbers from 1 to 3999 to canonical Roman numerals, or check and convert canonical Roman numerals.
Significant Figures Converter
Round a decimal string to a chosen number of significant figures with exact half-up rounding and preserved trailing zeros.
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