Inches to CM Converter
Convert inches to centimetres in your browser, with a full reference table and the formula behind it. Free, instant, no sign-up.
How to convert inches to centimetres
centimetres = inches × 2.54
One inche is 2.54 centimetres, so any conversion is a single multiplication. To go the other way, divide by 2.54 instead. The converter above is already set to inches and centimetres, so you can type any value and read the answer straight away.
Inches to CM conversion table
Common values, worked out in advance:
| 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 |
| 15 in | 38.1 cm |
| 20 in | 50.8 cm |
| 25 in | 63.5 cm |
| 30 in | 76.2 cm |
| 50 in | 127 cm |
| 100 in | 254 cm |
The quick mental version
For a rough answer without a calculator, remember that 1 cm is about 0.393701 in. That is usually close enough for shopping, travel and DIY, and the converter above gives you the exact figure when it matters.
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Frequently asked questions
How many centimetres are in 1 in?
One in is 2.54 cm. The table above covers the values people look up most often.
What is the formula to convert inches to centimetres?
centimetres = inches × 2.54. One inche is 2.54 centimetres, so any conversion is a single multiplication. To go the other way, divide by 2.54 instead.
Is this inches to cm converter accurate?
Yes. It uses the exact internationally defined conversion factors and calculates in your browser, so nothing is rounded until the result is displayed.
Can I convert centimetres back to inches here?
Yes. Use the swap button in the converter to reverse the direction, or pick any other pair of units from the two dropdowns.