Centimeters to Inches (cm to in)
A fast centimeters-to-inches calculator – the result updates as you type.
1 cm = 0.393701 in
1 cm = 0.393701 in. Enter a value and get the result instantly. Below you will find the formula and a table of commonly used values.
Formula
in = cm × 0.39370079
cm to in table
| cm | in |
|---|---|
| 1 cm | 0.3937 in |
| 2 cm | 0.7874 in |
| 5 cm | 1.9685 in |
| 10 cm | 3.937 in |
| 20 cm | 7.874 in |
| 50 cm | 19.685 in |
| 100 cm | 39.3701 in |
| 500 cm | 196.8504 in |
| 1,000 cm | 393.7008 in |
Where it is used
Centimetres are converted to inches when buying clothes, furniture or electronics from foreign shops. For example, a 15.6-inch laptop screen is about 39.6 cm diagonally, and airline cabin-bag dimensions are sometimes given in inches.
A quick mental shortcut
1 inch = 2.54 cm exactly, so 1 cm = 0.3937 inch. Roughly, divide by 2.5 or multiply by 0.4.
Examples: 180 cm / 2.54 = 70.87 inches; 55 cm / 2.54 = 21.65 inches; the quick estimate 180 x 0.4 = 72 is approximate.
Good to know
The inch was defined as exactly 2.54 cm in 1959 by agreement between the USA, the United Kingdom and other countries.