Centimeters to Inches
2.54 centimeters = 1 international inch. Conversion runs in your browser.
Conversion result
Inches = centimeters ÷ 2.54; centimeters = inches × 2.54.
Primary source: NIST SP 811, Appendix B.8 conversion factors. One international inch is exactly 2.54 centimeters.
Worked example: 30 centimeters ÷ 2.54 = 11.811023622 inches; 10 centimeters = 3.93700787402 inches.
Common conversion values
| centimeters | international inches |
|---|---|
| 1 | 0.393700787402 |
| 2.54 | 1 |
| 10 | 3.93700787402 |
| 30 | 11.811023622 |
| 100 | 39.3700787402 |
The table shows reference quantities; displayed results are rounded to at most 12 significant digits. Reverse conversions divide by the forward factor.
How to use this tool
Enter a quantity in centimeters, select the forward or reverse direction, and choose Convert. Decimal, fraction and mixed-fraction inputs are supported.
Frequently asked questions
What factor is used?
One international inch is exactly 2.54 centimeters. Inches = centimeters ÷ 2.54; centimeters = inches × 2.54.
Can I convert in reverse?
Yes. Select the reverse direction; it uses the same exact unit definitions and reverses the factor.
What does this page calculate?
It converts between the named units. Ounces means avoirdupois mass ounces here, not fluid ounces. The result does not imply measurement accuracy.