Millimetres to Inches Converter
Convert millimetres (mm) to inches (in) instantly. Length conversions come up when reading overseas furniture specs, cycling the Round Island Route in kilometres while a foreign app shows miles, or checking marine distances in the Singapore Strait in nautical miles.
Result
- Inches
- 0.03937 in
How to use the millimetres to inches converter
- Enter the millimetres (mm).
- The results update as you type, or press Calculate.
- Read the inches first, then the supporting figures below it.
Formula
Inches = millimetres × 0.0393700787
Worked example
For example, with these inputs:
- Millimetres (mm): 1
the calculator returns:
- Inches: 0.03937 in
Millimetres to Inches table
| Millimetres | Inches |
|---|---|
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.393701 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.937 in |
| 250 mm | 9.8425 in |
| 500 mm | 19.685 in |
| 1,000 mm | 39.3701 in |
About this conversion
Length conversions come up when reading overseas furniture specs, cycling the Round Island Route in kilometres while a foreign app shows miles, or checking marine distances in the Singapore Strait in nautical miles.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Frequently asked questions
How many inches are in one millimetre?
1 mm = 0.03937 in.
How do I convert mm to in?
Inches = millimetres × 0.0393700787.