Millimeters to Inches Converter
Convert millimeters to inches instantly. 1 mm = 0.03937 in. Free two-way converter with the formula and a quick reference table.
How to convert millimeters to inches
inches = millimeters × 0.03937
One millimeter equals 0.03937 inches, so to convert millimeters to inches you multiply by 0.03937. Going the other way, one inch is 25.4 millimeters. Both units measure length, so the conversion is an exact ratio that never changes.
10 millimeters = 0.393701 inches. Multiply your millimeter figure by the factor above (or just type it into the box) to convert any amount.
Need the other direction? inches to millimeters
millimeters to inches table
| millimeters (mm) | inches (in) |
|---|---|
| 1 | 0.03937 |
| 2 | 0.07874 |
| 3 | 0.11811 |
| 5 | 0.19685 |
| 10 | 0.393701 |
| 20 | 0.787402 |
| 25 | 0.984252 |
| 50 | 1.9685 |
| 100 | 3.937 |
| 250 | 9.8425 |
| 500 | 19.685 |
| 1,000 | 39.3701 |
Frequently asked questions
How many inches are in a millimeter?
One millimeter equals 0.03937 inches. So to convert, multiply the number of millimeters by 0.03937.
How do I convert millimeters to inches?
Multiply by 0.03937, or simply enter the value in the converter above — it does the math instantly and works both ways.
Is this conversion exact?
Yes — both units measure the same quantity, so the ratio is fixed and this uses the standard internationally-agreed factor.