How many centimeters are in one inch?
One inch is 2.54 cm.
Inches to Centimeters
Type a value to convert it from inches to centimeters. One in equals 2.54 cm.
Result
Inches and centimeters, side by side
One inch is 2.54 cm. In the other direction, one centimeter is 0.3937 in.
The factor is exact rather than rounded: imperial and US units have been defined from the metric ones since 1959, so the conversion introduces no error of its own. What you see below is arithmetic, not an approximation.
The inch has been exactly 2.54 centimeters since the international yard and pound agreement of 1959. It survives worldwide in screen sizes, which measure the diagonal, in wheel rims and in pipe fittings, and in the United States for everyday lengths.
The centimeter is one hundredth of a meter, the everyday metric unit for body height, clothing and furniture. Outside the United States a person’s height is usually given in centimeters, and an A4 sheet measures 21 by 29.7 cm.
| Inch | Centimeter |
|---|---|
| 1 | 2.54 |
| 5 | 12.7 |
| 10 | 25.4 |
| 20 | 50.8 |
| 50 | 127 |
| 100 | 254 |
Frequently asked questions
How do I convert centimeters back to inches?
One centimeter is 0.3937 in. The tool above converts in both directions.
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