MM to Inches Converter
Convert millimeters to inches (mm to in) instantly, with the formula and a conversion chart.
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How to convert millimeters to inches
1 millimeter = 0.0393701 inches. To convert millimeters to inches, multiply by 0.0393701.
Example: 10 mm = 0.3937 in.
Screws, drill bits, jewelry, rainfall and camera lenses are measured in millimeters; many tools and plans in the US use fractions of an inch.
MM to Inches conversion chart
| Millimeters | Inches |
|---|---|
| 1 mm | 0.0394 in |
| 2 mm | 0.0787 in |
| 3 mm | 0.1181 in |
| 5 mm | 0.1969 in |
| 6 mm | 0.2362 in |
| 8 mm | 0.315 in |
| 10 mm | 0.3937 in |
| 12 mm | 0.4724 in |
| 15 mm | 0.5906 in |
| 20 mm | 0.7874 in |
| 25.4 mm | 1 in |
| 50 mm | 1.969 in |
How to use this tool
- 1Type the number of millimeters in the Value box.
- 2The result in inches appears instantly.
- 3Use the ⇄ button to convert inches to millimeters instead, or pick any other unit.
Features
- Exact mm to in conversion using the standard definition.
- Results update as you type, rounded to 6 decimal places.
- Switch to any other length, weight, temperature, volume or speed unit.
Privacy
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Frequently asked questions
How many mm are in an inch?
Exactly 25.4 mm.
What fraction of an inch is 3 mm?
3 mm is 0.118 inches — just under 1/8 inch (0.125).
How do I convert inches back to millimeters?
Divide by 0.0393701 (or multiply by 25.4), or use the swap button in the converter above or the Inches to MM converter.
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