Converters • Length Converter
Inches to MM Conversion Calculator
Converting imperial inches to metric millimeters is fundamental across CAD design, 3D printing, and mechanical engineering.
Converted Result
25.4 mm
1 in = 25.4 mm
Equivalent Values in Other Units
Meter
0.0254 m
Kilometer
0 km
Centimeter
2.54 cm
Mile
0 mi
Yard
0.0278 yd
Foot
0.0833 ft
Nautical Mile
0 NM
Reverse Conversion Available
MM to Inches Converter (Millimeters to Inches)
Formula & Calculation Method
To convert inches to millimeters, multiply the inch value by exactly 25.4.
Conversion Formula
Millimeters = Inches × 25.4
Step-by-Step Worked Example
To convert 1/2 inch (0.5 in) to millimeters: 0.5 × 25.4 = 12.7 mm.
Inch to Millimeter Conversion Table
Quick reference values for common inch measurements.
1 in = 25.4 mm
| Inch (in) | Millimeter (mm) |
|---|---|
| 0.125 in | 3.175 mm |
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 0.75 in | 19.05 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 8 in | 203.2 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
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Frequently Asked Questions
There are exactly 25.4 millimeters in 1 inch.