Millimeters to Inches Converter
Convert millimeters (mm) to inches (in) instantly. Type a value above and the result updates while you type. 1 millimeter equals 0.03937 inches.
Result updates as you type. Values are calculated locally in your browser — nothing is sent to a server.
The formula
1 millimeter = 0.03937 inches
Multiply the millimeters value by 0.03937 to get inches. Or divide by 25.4 to go the other way.
Millimeters to inches conversion table
| mm | in |
|---|---|
| 1 | 0.03937 |
| 2 | 0.07874 |
| 3 | 0.11811 |
| 4 | 0.15748 |
| 5 | 0.19685 |
| 6 | 0.23622 |
| 7 | 0.275591 |
| 8 | 0.314961 |
| 9 | 0.354331 |
| 10 | 0.393701 |
| 15 | 0.590551 |
| 20 | 0.787402 |
| 25 | 0.984252 |
| 50 | 1.9685 |
| 75 | 2.95276 |
| 100 | 3.93701 |
Worked examples
- 10 mm × 0.03937 = 0.393701 in
- 25.4 mm × 0.03937 = 1 in
- 300 mm × 0.03937 = 11.811 in
Conversion factors follow the exact international definitions (SI/BIPM; imperial units per the 1959 International Yard and Pound Agreement, maintained by NIST). NIST unit conversion reference
Factors last verified August 2026 · Built by Jeffrey Tepper.
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Frequently asked questions
How many inches are in 1 millimeter?
1 millimeter equals 0.03937 inches (mm → in).
How do you convert millimeters to inches?
Multiply the number of millimeters by 0.03937. For example: 10 mm × 0.03937 = 0.393701 in.
What is 50 mm in in?
50 mm equals 1.9685 in.
Which is bigger: 1 millimeter or 1 inch?
1 inch is bigger: 1 millimeter is only 0.03937 inches.