Mm to in conversion formula
1 millimeter = 0.03937 inch
The millimeter (mm) is one thousandth of a meter — the standard for engineering tolerances, rainfall and small parts.
The inch (in) is an imperial unit equal to exactly 2.54 centimeters since 1959, by international agreement. Widely used for screens, tools and body measurements.
Mm to in conversion table
| mm | in |
|---|---|
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 3 mm | 0.11811 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 |
| 1000 mm | 39.3701 in |
How to convert mm to in
- Write down the value in mm you want to convert.
- Multiply it by 0.03937 — or use the converter above, which does it instantly.
- Read your result in in. Done.
Frequently asked questions
How many in is 1 mm?
Using the official conversion factor, 1 millimeter = 0.03937 inch. The converter above handles any value instantly.
What is the formula to convert millimeter to inch?
1 millimeter = 0.03937 inch. Multiply any value in mm by this factor to get in.
Is this mm to in converter free?
Yes — 100% free, unlimited, with no sign-up. CalculUnits is funded by non-intrusive ads, never by paywalls.