Inches to Millimeters
Type a value in in and the mm equivalent appears instantly.
How to convert in to mm
Multiply the in value by 25.4.
1 in = 25.4 mm
Quick conversion table
| in | mm |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 20 | 508 |
| 50 | 1270 |
| 100 | 2540 |
| 500 | 12700 |
| 1000 | 25400 |
About the units
Inches (in): 1/12 of a foot, defined as exactly 2.54 cm since 1959. Screens, waistlines and rainfall in the US.
Millimeters (mm): One thousandth of a meter, the everyday unit for fine measurements in engineering and manufacturing.