Inches to Centimetres
Convert inches (in) to centimetres (cm) instantly — with formula and reference table.
Quick answer: 1 in = 2.54 cm. To convert inches to centimetres, multiply by in × 2.54.
Converting inches to centimetres
This converter changes a value in inches (in) into centimetres (cm). One inche equals 2.54 cm. One inch equals exactly 2.54 centimetres by international definition, so converting inches to centimetres is a simple multiplication by 2.54. The conversion runs entirely in your browser — enter a value and the result updates instantly, in either direction.
Formula
cm = in × 2.54
Example
Convert 10 in to cm: 10 × 2.54 = 25.4 cm.
Inches to Centimetres conversion table
| Inches (in) | Centimetres (cm) |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 5 in | 12.7 cm |
| 10 in | 25.4 cm |
| 20 in | 50.8 cm |
| 25 in | 63.5 cm |
| 50 in | 127 cm |
| 100 in | 254 cm |
How to use this converter
- Enter a value in the inches (in) field.
- Read the converted value in centimetres (cm) below.
- Type into the cm field instead to convert in reverse, or use the swap button.
Frequently asked questions
How many centimetres are in an inch?
1 inch equals exactly 2.54 centimetres.
How do I convert 12 inches to cm?
12 × 2.54 = 30.48 cm. One foot is 30.48 centimetres.
Is the inch-to-cm factor exact?
Yes. Since 1959 the inch has been defined as exactly 2.54 cm, so the conversion is exact, not rounded.