CONVERSION · EN
cm to inches (cm → in)
Convert centimetres to international inches with the formula, common examples and local browser calculation.
Guide
Formula
inches = centimetres ÷ 2.54
Because 1 inch equals exactly 2.54 cm, the conversion is a direct division. Centimetres and inches are both length units, and no regional approximation is applied.
Note : If your measurement is written in feet and inches, use the dedicated page so both components are preserved.
Example : 10 cm
Common conversions
Display rounded to at most 6 decimal places.
| cm | in |
|---|---|
| 1 | 0.393701 |
| 2.54 | 1 |
| 5 | 1.968504 |
| 10 | 3.937008 |
| 30 | 11.811024 |
| 50 | 19.685039 |
| 100 | 39.370079 |
Related conversions
Definition sources
Measurement
Enter a value and its unit.
Calculation details and sources are available below the result.
Enter a measurement: its unit is detected automatically.
Useful conversions
Approximate fraction
This approximation certifies neither a part nor an instrument’s accuracy.
Fractions and precision
| Step | Fraction | Error in mm | Limit |
|---|
Error = approximate fraction − requested measurement. Exact comparison before display rounding.
A list
One measurement per line. The unit is detected independently on every line, including common typos.
Applies only to numbers without a unit. Written units always take precedence.
For bare numbers, choose their common unit. No unit is guessed.
No results.
Add your measurements, choose the targets, then convert.
| Line | Original | Detected | To | Result | Status |
|---|