Millimeters to Inches Converter
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Formula: multiply millimeters by 0.0393701 to get inches
How to convert millimeters to inches
To convert millimeters to inches, multiply the number of millimeters by 0.0393701. For example, 25.4 mm × 0.0393701 = 1 inch exactly. Going the other way, multiply inches by 25.4 to get millimeters.
Since 1 inch = 25.4 mm exactly, 1 mm = 1 ÷ 25.4 = 0.03937 inches. Millimeters are commonly used in engineering, manufacturing, woodworking, and medical devices.
This conversion is particularly useful for tool sizes, drill bits, pipe diameters, screen sizes, and any precision measurement that needs to be expressed in both metric and imperial units.
Millimeters to inches conversion table
| Millimeters (mm) | Inches (in) | Fraction (approx) |
|---|---|---|
| 1 mm | 0.03937 in | ≈ 1/32 in |
| 2 mm | 0.07874 in | ≈ 5/64 in |
| 3 mm | 0.11811 in | ≈ 1/8 in |
| 4 mm | 0.15748 in | ≈ 5/32 in |
| 5 mm | 0.19685 in | ≈ 13/64 in |
| 6 mm | 0.23622 in | ≈ 15/64 in |
| 8 mm | 0.31496 in | ≈ 5/16 in |
| 10 mm | 0.39370 in | ≈ 3/8 in |
| 12 mm | 0.47244 in | ≈ 15/32 in |
| 15 mm | 0.59055 in | ≈ 19/32 in |
| 20 mm | 0.78740 in | ≈ 25/32 in |
| 25 mm | 0.98425 in | ≈ 63/64 in |
| 25.4 mm | 1.00000 in | = 1 inch exactly |