mm to inches Converter
1 mm = 0.03937 in. Enter a value. The result updates immediately.
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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
- Enter the value in mm.
- Select mm as the source unit.
- Select inches as the target unit.
- Read or copy the result.
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.