Length conversion
Inches to Millimeters
Convert fastener sizes, material thicknesses, and equipment dimensions from inches to precise millimeter values.
Inches
1 in
Millimeters
25.4 mm
mm = in × 25.4
The formula
How to convert inches to millimeters
Apply mm = in × 25.4. For example, 0.125 in equals 3.175 mm.
Precision
Accurate constants, readable results
OmniUnit calculates with the full stored conversion factor, then displays up to 12 significant digits.
Common inches conversions
| Inches | Millimeters |
|---|---|
| 0.125 in | 3.175 mm |
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 10 in | 254 mm |