Convert millimeters to inches
Millimeter (mm) to inch (in). One millimeter equals 0.03937 inches.
Formula
Millimeter to inch conversion table
| Millimeters | Inches | Inches | Millimeters |
|---|---|---|---|
| 1 mm | 0.03937 in | 1 in | 25.4 mm |
| 2 mm | 0.07874 in | 2 in | 50.8 mm |
| 3 mm | 0.11811 in | 3 in | 76.2 mm |
| 5 mm | 0.19685 in | 5 in | 127 mm |
| 10 mm | 0.393701 in | 10 in | 254 mm |
| 20 mm | 0.787402 in | 20 in | 508 mm |
| 50 mm | 1.9685 in | 50 in | 1270 mm |
| 100 mm | 3.937 in | 100 in | 2540 mm |
| 500 mm | 19.685 in | 500 in | 12700 mm |
| 1000 mm | 39.3701 in | 1000 in | 25400 mm |
To convert millimeters to inches, divide the number of millimeters by 25.4. One millimeter equals 0.03937 inches, and one inch equals 25.4 millimeters, so the relationship is fixed and exact. As a worked example, 10 mm comes to 0.393701 in. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a length conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common millimeter values already worked out in inches, plus the reverse inch to millimeter direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many inches are in a millimeter?
One millimeter equals 0.03937 inches. The ratio is constant, so you can multiply any number of millimeters by 0.03937 to get inches.
What is the formula to convert millimeters to inches?
Use inches = millimeters ÷ 25.4. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert inches back to millimeters?
Go the other way by using one inch equals 25.4 millimeters. You can also press the swap button in the converter above to flip the direction in one click.
Is this millimeter to inch converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.