How to convert inches to centimeters
One inch is exactly 2.54 centimeters, by international agreement since 1959. So converting is a single multiplication, and the result is exact.
Formula: cm = inches × 2.54
Example: 12 inches × 2.54 = 30.48 cm (one foot)
in to cm table
| Inches (in) | Centimeters (cm) |
|---|---|
| 0.25 | 0.64 |
| 0.5 | 1.27 |
| 1 | 2.54 |
| 2 | 5.08 |
| 3 | 7.62 |
| 4 | 10.16 |
| 5 | 12.7 |
| 6 | 15.24 |
| 8 | 20.32 |
| 10 | 25.4 |
| 12 | 30.48 |
| 15 | 38.1 |
| 18 | 45.72 |
| 20 | 50.8 |
| 24 | 60.96 |
| 30 | 76.2 |
| 32 | 81.28 |
| 36 | 91.44 |
| 40 | 101.6 |
| 50 | 127 |
| 55 | 139.7 |
| 65 | 165.1 |
| 75 | 190.5 |
| 100 | 254 |
Values are rounded to 2 decimal places.
Common inch sizes in centimeters
- A 27-inch computer monitor measures 68.6 cm across the diagonal
- A 12-inch pizza is 30.5 cm wide
- A waist of 32 inches is 81.3 cm
- Shoe and ring sizes are not straight inch conversions — use a size chart for those
How to use it
- Type a number in the From box — the answer appears straight away
- Click Swap (⇄) to convert the other way, from centimeters to inches
- Change the units or the category to convert anything else — length, weight, temperature, volume, speed and more
Frequently asked questions
How many cm is 1 inch?
Exactly 2.54 centimeters. It is a defined value, not a measurement, so no rounding is needed.
How many cm are in a foot?
A foot is 12 inches, so 12 × 2.54 = 30.48 cm.
Why do TV and screen sizes use inches?
Screen sizes are measured corner to corner in inches almost everywhere, even in metric countries. A 55-inch TV is 139.7 cm across the diagonal.
Is my data sent anywhere?
No. The conversion runs in your browser, on your own device.
Related tools
- Unit Converter — every unit in one place
