Length converter
Inches to Millimeters Converter
Convert inches (in) to millimeters (mm) instantly using the converter below.
1 in = 25.4 mm
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Formula
mm = in × 25.4
1 in = 25.4 mm
Worked example
To convert 10 in, apply the formula:
10 in = 254 mm
Quick conversion table
| in | mm |
|---|---|
| 1 | 25.4 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1270 |
| 100 | 2540 |
About the units
Inches: An international inch is exactly 25.4 millimeters.
Millimeters: A millimeter is one thousandth of a meter.