Length and Area
intocm
Convert inches (in) to centimetres (cm).
Factor1 in = 2.54 cm
Converter
in
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cm
Rendered to 6 significant figures.
Formula
Formula
cm = in × 2.54
Multiply any value in inches by 2.54 to obtain the value in centimetres.
Worked example
Convert 10 in to cm.
- 01Start with 10 in.
- 02Multiply by the conversion factor: 10 × 2.54 = 25.4 cm.
Result10 in = 25.4 cm
Conversion table
| in | cm |
|---|---|
| 1 | 2.54 |
| 2 | 5.08 |
| 5 | 12.7 |
| 10 | 25.4 |
| 20 | 50.8 |
| 50 | 127 |
| 100 | 254 |
| 200 | 508 |
| 500 | 1270 |
| 1000 | 2540 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from in to cm?
1 in equals 2.54 cm. To convert, multiply the value in inches by 2.54.
How do I convert 1 in to cm?
1 in = 2.54 cm. For any value, multiply by 2.54.
How do I convert cm back to in?
Divide by the same factor — or equivalently, multiply by 0.3937008. So 1 cm = 0.393701 in.
When would I need to convert inch to centimetre?
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 in and cm are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).