Length and Area
cmtoin
Convert centimetres (cm) to inches (in).
Factor1 cm = 0.3937008 in
Converter
cm
Accepts numbers or expressions, e.g. 150 + 14.7
Result
in
Rendered to 6 significant figures.
Formula
Formula
in = cm × 0.3937008
Multiply any value in centimetres by 0.3937008 to obtain the value in inches.
Worked example
Convert 10 cm to in.
- 01Start with 10 cm.
- 02Multiply by the conversion factor: 10 × 0.3937008 = 3.93701 in.
Result10 cm = 3.93701 in
Conversion table
| cm | in |
|---|---|
| 1 | 0.3937 |
| 2 | 0.7874 |
| 5 | 1.9685 |
| 10 | 3.937 |
| 20 | 7.874 |
| 50 | 19.685 |
| 100 | 39.37 |
| 200 | 78.74 |
| 500 | 196.85 |
| 1000 | 393.7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cm to in?
1 cm equals 0.3937008 in. To convert, multiply the value in centimetres by 0.3937008.
How do I convert 1 cm to in?
1 cm = 0.393701 in. For any value, multiply by 0.3937008.
How do I convert in back to cm?
Divide by the same factor — or equivalently, multiply by 2.54. So 1 in = 2.54 cm.
When would I need to convert centimetre to inch?
Length conversions appear in piping, layout, and mechanical drawings — particularly when reconciling imperial fittings or instrument lengths with metric plant drawings.
Is the conversion exact?
Yes. Both cm and in are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).