Length
mm to inches Converter
1 mm = 0.03937 in. Enter any value and the result updates instantly.
Convert
Accuracy and rounding
For small parts, drill bits, fasteners, and specs.
Mm and inches are tied back to the SI meter through fixed definitions, so the underlying conversion factor is stable.
For cutting, fitting, drawings, and product specs, keep extra decimals in inches and round only at the final step.
How to convert mm to inches
- Type the mm value in the calculator.
- Keep mm selected as the from unit and inches selected as the to unit.
- Use the instant result, or copy it with the copy button.
mm to inches chart
| mm | inches |
|---|---|
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.3937 in |
| 25 mm | 0.98425 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.937 in |
Formula
in = mm x 0.03937007874
Example: 1 mm = 0.03937 in.
Source
SI meter definitions and exact international inch, foot, yard, and mile relationships.
Common questions
How do I convert mm to inches?
Enter the mm value in the converter, or multiply by the factor shown in the formula. 1 mm = 0.03937 in.
What should I watch out for?
Round only after converting if the measurement is used for cutting, fitting, or specifications.
Where does this length conversion come from?
SI meter definitions and exact international inch, foot, yard, and mile relationships. ConverterBase uses stable definitions and fixed conversion factors, not live or rounded market data.