Millimeters to Inches Converter
Convert millimeters to inches instantly.
Standard length units
Fun comparisons
How to convert millimeters to inches
Enter your value in millimeters and see the result in inches instantly. The converter also shows fun real-world comparisons - like the height of famous buildings or the length of football fields - to help you picture the distance.
Millimeters are the standard for drill bit sizes, screen bezels and precision parts outside the US; inches are the US equivalent for hardware and tools. This conversion is essential for ordering parts across measurement systems.
Need the opposite direction? Convert inches to millimeters just as easily, or explore all our length conversions.
Common millimeters to inches conversions
| Millimeters (mm) | Inches (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 |
Frequently asked questions
1 millimeters equals 0.0393701 inches.
Multiply by 0.0393701. For example, 5 mm = 0.19685 in.
A 10mm socket equals approximately 0.393701 inches - close to but not exactly 3/8 inch (0.375 inches), which is why metric and imperial socket sets are sold separately.
1 inches equals 25.4 millimeters.
100 millimeters equals 3.93701 inches.