ROI Calculator
Result
Formula: ROI = (final value − cost) / cost × 100.
Worked example: A cost of 100 and final value of 125 gives 25% ROI; a cost of 80 and final value of 100 gives 25% ROI.
Primary source: OpenStax Principles of Finance, rate of return. The linked text describes the mathematical definition or method used.
How to use this tool
Enter the numbers and choose Calculate to compute return on investment. Results are calculated in this browser.
Frequently asked questions
What does this calculator compute?
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.
Where do the inputs go?
The calculation runs in this browser; the page does not submit the entered values.
What formula is used?
The result displays the formula used: ROI = (final value − cost) / cost × 100.