Millimetre to Inch
Free instant millimetre to inch converter. 1 mm = 0.0393701 in.
Common Millimetre to Inch values
| Millimetre (mm) | Inch (in) |
|---|---|
| 1 | 0.0393701 |
| 5 | 0.19685 |
| 10 | 0.393701 |
| 25 | 0.984252 |
| 50 | 1.9685 |
| 100 | 3.93701 |
| 500 | 19.685 |
| 1000 | 39.3701 |
How does Millimetre to Inch conversion work?
Type a value in the Millimetre (mm) field and the equivalent in Inch (in) appears instantly to the right. The math uses the exact formula shown above — no rounding errors, no approximations beyond standard floating-point precision. Use the swap button to flip the units and see the inverse conversion.
Millimetre. One thousandth of a metre. About the thickness of a credit card. Standard in engineering and woodworking.
Inch. One twelfth of a foot. About the width of a thumb. Standard for screen sizes, paper, and precision measurement in the US.
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🎯 Accurate conversions
Conversion factors come from the official standard (NIST, BIPM, ISO definitions where applicable). Values are precise to standard floating-point limits.
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