How to convert Millimeters to Inches
The conversion is a single multiplication: 1 mm = 0.03937 in. To convert millimeters to inches, multiply by 0.03937. To go back, multiply inches by 25.4 (or divide by 0.03937). These factors are exact by definition.
Examples
- 1 mm = 0.03937 in
- 12 mm = 0.472441 in
Millimeters to Inches conversion table
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 | 0.03937 |
| 2 | 0.07874 |
| 3 | 0.11811 |
| 4 | 0.15748 |
| 5 | 0.19685 |
| 10 | 0.393701 |
| 20 | 0.787402 |
| 25 | 0.984252 |
| 50 | 1.968504 |
| 100 | 3.937008 |
Frequently asked questions
- How do I convert Inches back to Millimeters?
- Use the Inches to Millimeters converter, or just swap the units on the full unit converter — it shows every unit in the category at once.
- Are these conversion factors exact?
- Yes. The English units have been defined in metric terms since 1959, so the factors used here are exact by definition, not rounded approximations. Displayed results are rounded only for readability.
- Can I convert other units too?
- The unit converter also handles length, weight, volume, temperature, area, speed, pressure, energy, power, torque, and fuel economy — each with every unit shown side by side.