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Centimetres and inches measure the same thing in two systems — metric and imperial — so switching between them is a fixed multiplication. Whether you're reading a screen size, a piece of furniture or a clothing measurement, this converter turns centimetres into inches and back in one step.
How is it calculated?
The conversion factor
The relationship is exact and defined: 1 inch = 2.54 centimetres.
| To convert | Do this |
|---|---|
| cm → inches | divide by 2.54 |
| inches → cm | multiply by 2.54 |
Common values
| Centimetres | Inches |
|---|---|
| 1 cm | 0.39 in |
| 10 cm | 3.94 in |
| 30 cm | 11.81 in |
| 100 cm | 39.37 in |
Worked example
A 152 cm height converts to 152 ÷ 2.54 = 59.84 inches, which is about 4 feet 11.8 inches. Going the other way, a 32-inch waist is 32 × 2.54 = 81.3 cm.
FAQ
How many inches is 1 cm?+
One centimetre is 0.3937 inches — a little under four tenths of an inch. To convert any number of centimetres to inches, divide by 2.54.
How do I convert cm to inches?+
Divide the centimetre value by 2.54, since 1 inch is defined as exactly 2.54 cm. For example, 50 cm ÷ 2.54 = 19.69 inches.
Is the inch exactly 2.54 cm?+
Yes. Since 1959 the international inch has been defined as exactly 2.54 centimetres, so the conversion is exact, not an approximation.
How do I convert inches back to cm?+
Multiply the inch value by 2.54. A 40-inch TV is 40 × 2.54 = 101.6 cm wide diagonally.
What is 100 cm in inches?+
100 cm is 39.37 inches, or about 3 feet 3.4 inches. One metre is just under 3 feet 3.5 inches.