Centimeters to Inches Converter

About the cm to in calculation

One centimeter is exactly 0.393701 inches, so converting between them is a single multiplication. Enter any value above and the result updates as you type. How height and clothing sizes are quoted almost everywhere outside the US. Still standard for screen sizes, pipe diameters and tyre rims worldwide.

Formula

in = cm × 0.393701

1 cm = 0.393701 in
1 in = 2.54 cm

Worked example

To convert 180 cm, multiply by 0.393701: 180 × 0.393701 = 70.8661 in.

Frequently asked questions

How many inches are in a centimeter?

There are 0.393701 inches in one centimeter. To convert any amount, multiply the number of centimeters by 0.393701.

How do I convert inches back to centimeters?

Divide instead of multiplying, or equivalently multiply by 2.54. One inch is 2.54 centimeters.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between centimeters and inches is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Centimeters: how height and clothing sizes are quoted almost everywhere outside the US. Inches: still standard for screen sizes, pipe diameters and tyre rims worldwide.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units