About converting centimetres to inches
One inch is exactly 2.54 centimetres. That is a definition rather than a measurement - the international yard and pound agreement of 1959 fixed it - so every conversion on this page is exact arithmetic, not an approximation.
To go the other way, divide by 2.54. For a rough figure in your head, divide the centimetres by 2.5, which is within 2% and usually close enough for clothing and furniture.
Centimetre to Inch reference table
| Centimetre | Inch |
|---|---|
| 1 cm | 0.393701 in |
| 2 cm | 0.787402 in |
| 5 cm | 1.9685 in |
| 10 cm | 3.93701 in |
| 15 cm | 5.90551 in |
| 20 cm | 7.87402 in |
| 25 cm | 9.84252 in |
| 30 cm | 11.811 in |
| 40 cm | 15.748 in |
| 50 cm | 19.685 in |
| 60 cm | 23.622 in |
| 75 cm | 29.5276 in |
| 100 cm | 39.3701 in |
| 150 cm | 59.0551 in |
| 180 cm | 70.8661 in |
| 200 cm | 78.7402 in |
Frequently asked questions
- How many inches is 30 cm?
- 11.811 inches, or just under a foot. The conversion is 30 ÷ 2.54.
- Why is an inch exactly 2.54 cm?
- Because six countries agreed to define it that way in 1959, to end a situation where the American and British inches differed by about two parts in a million. Before that, the inch was defined by physical standards that did not quite agree.
- Is anything I enter sent anywhere?
- No. The conversion runs inside your browser. Nothing you type is uploaded, stored or logged, and the page keeps working with the network disconnected.
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