length conversion
Convert Inches to Centimeters
One inch equals 2.54 centimeters. Enter any value below for an exact conversion.
How to convert Inches to Centimeters
- Type the number of inches into the first field.
- The equivalent in centimeters appears immediately.
- Swap the units to convert in the opposite direction.
Inches to Centimeters formula
cm = in × 2.54
Worked example: to convert 12 in, multiply 12 × 2.54 = 30.48 cm.
This conversion factor is exact by international definition rather than measured, so the only rounding is whatever you apply to the final answer.
Inches to Centimeters conversion table
| Inches | Centimeters |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 5 in | 12.7 cm |
| 10 in | 25.4 cm |
| 25 in | 63.5 cm |
| 50 in | 127 cm |
| 100 in | 254 cm |
What is a inch?
Defined as exactly 25.4 millimeters since 1959. Screen sizes, pipe diameters and paper stock are quoted in inches worldwide, regardless of local measurement system.
What is a centimeter?
One hundredth of a meter. The default unit for human height and clothing measurements outside the United States.
Frequently asked questions
How many centimeters are in a inch?
One inch is 2.54 centimeters.
How do I convert inches to centimeters in my head?
Multiply by 2.5 and add 2%. 12 in → 30 + 0.6 = 30.6 cm, close to the exact 30.48.
Is the conversion exact?
Yes. Both units are defined in terms of each other by international agreement, so the factor 2.54 is exact rather than approximate.
How many inches is 100 cm?
100 cm is 39.3701 in.
Which countries use centimeters?
Everywhere except the United States, for human height, clothing and general measurement.
Is my data uploaded to convert it?
No. The arithmetic runs in your browser. Nothing is sent anywhere.