Inches to millimetres
1 in = 25.4 mm
All units in this category
- 25.4mm
- 2.54cm
- 0.0254m
- 0.0000254km
- 0.00000254mil
- 1in
- 0.083333333ft
- 0.027777778yd
- 0.000015782828mi
- 0.000013714903M
Formula
Multiply the value in inches by 25.4 to get millimetres.
mm = in × 25.4
How to convert inches to millimetres
Type a value in the field above and the result is calculated instantly. Use the arrow button to swap direction, or pick other units from the lists.
Inches to millimetres – common values
| Inches (in) | Millimetres (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 5 | 127 |
| 10 | 254 |
| 20 | 508 |
| 50 | 1,270 |
| 100 | 2,540 |
| 500 | 12,700 |
| 1,000 | 25,400 |
About the units
Inches. An inch is exactly 2.54 centimetres and is used for screen sizes among other things.