Cm to inches
One cm equals 0.3937007874 in. Type any number and the answer appears as you type — the maths happens in your browser.
Result
The same value in every unit
| Unit | Value |
|---|
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Common values
| cm | inches |
|---|---|
| 1 cm | 0.39370079 in |
| 2 cm | 0.78740157 in |
| 3 cm | 1.1811024 in |
| 5 cm | 1.9685039 in |
| 10 cm | 3.9370079 in |
| 15 cm | 5.9055118 in |
| 20 cm | 7.8740157 in |
| 25 cm | 9.8425197 in |
| 50 cm | 19.685039 in |
| 100 cm | 39.370079 in |
| 500 cm | 196.85039 in |
| 1000 cm | 393.70079 in |
How to use
- Enter the number of cm in the field.
- The result in inches updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: in = cm ÷ 2.54. Going back the other way, one in is 2.54 cm.
Where the odd number comes from
The factor is not a round number because the imperial units are defined through the metric ones by international agreement: an inch is exactly 25.4 mm and a pound is exactly 0.45359237 kg. Everything else follows from those definitions.
in = cm ÷ 2.54
Frequently asked questions
How many inches are in one cm?
One cm is 0.3937007874 in.
How do I convert cm to inches?
Multiply by the factor: in = cm ÷ 2.54.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert inches back to cm?
One in is 2.54 cm — or open the reverse page linked below.