inch to millimeter (in → mm)
Unit ConverterConverting inch (in) to millimeter (mm), 1in is about 25.4mm.
What is it
inch is a length unit, as is millimeter. Their relation is fixed: 1in = 25.4mm.
mm = in × 25.4
How to use
- 1Enter the inch (in) value.
- 2See the millimeter (mm) result instantly.
- 3Switch units to convert again if needed.
Reference
| in | mm |
|---|---|
| 1 | 25.4 |
| 5 | 127 |
| 10 | 254 |
| 50 | 1,270 |
| 100 | 2,540 |
| 1000 | 25,400 |
Sources & standards
FAQ
How many mm is 1in?
1in is about 25.4mm.
How do I convert mm back to in?
Compute in = mm ÷ 25.4.
How many mm is 10in?
10in is about 254mm.