Millimeters ↔ Inches
Convert between millimeters and inches
Millimeters ↔ Inches
Quick Facts
- •1 inch = 25.4 mm
- •1 mm = 0.03937 inches
- •A credit card is about 0.76 mm thick
Millimeters and Inches
Millimeters are used for precision measurements in engineering, machining, jewelry, and electronics. One inch equals exactly 25.4 millimeters. This conversion is vital for anyone working with technical drawings or importing parts from countries using different measurement systems.
How to convert Millimeters to Inches
To convert millimeters to inches, multiply the number of millimeters by the conversion factor. The exact factor is 0.03937.
Formula
Inches = Millimeters × 0.03937
Worked example
Convert 10 mm to in: 10 mm = 0.3937 in.
Millimeters to Inches reference table
Use this quick lookup for common millimeters to inches values.
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 mm | 0.0394 in |
| 2 mm | 0.0787 in |
| 5 mm | 0.1969 in |
| 10 mm | 0.3937 in |
| 20 mm | 0.7874 in |
| 25 mm | 0.9843 in |
| 50 mm | 1.9685 in |
| 75 mm | 2.9528 in |
| 100 mm | 3.937 in |
| 250 mm | 9.8425 in |
Frequently asked questions
What is the formula to convert Millimeters to Inches?
Multiply the number of millimeters by 0.03937 to get inches. For example, 10 mm equals 0.3937 in.
How many inches are in 1 millimeter?
1 mm equals 0.0394 in.
How do I convert inches back to millimeters?
Reverse the formula: Millimeters = Inches ÷ 0.03937. For example, 100 in equals 2,540 mm.
Is this Millimeters to Inches converter accurate?
Yes. Conversions use the internationally accepted ratio for millimeters and inches and are calculated to 4 decimal places in your browser.
What is 10 mm in in?
10 mm equals 0.3937 in.
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This calculator is for educational and reference purposes only. Always verify critical calculations independently.