How to convert millimeters to inches
Divide the number of millimeters by 25.4. That is all there is to it, because the factor between millimeters and inches never changes.
Formula
in = mm ÷ 25.4
Example: 25 millimeters ÷ 25.4 = 0.984252 inches.
MM to Inches chart
| Millimeters (mm) | Inches (in) |
|---|---|
| 0.5 mm | 0.019685 in |
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 3 mm | 0.11811 in |
| 4 mm | 0.15748 in |
| 5 mm | 0.19685 in |
| 6 mm | 0.23622 in |
| 7 mm | 0.275591 in |
| 8 mm | 0.314961 in |
| 9 mm | 0.354331 in |
| 10 mm | 0.393701 in |
| 15 mm | 0.590551 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 30 mm | 1.1811 in |
| 40 mm | 1.5748 in |
| 50 mm | 1.9685 in |
| 60 mm | 2.3622 in |
| 70 mm | 2.7559 in |
| 75 mm | 2.9528 in |
| 80 mm | 3.1496 in |
| 90 mm | 3.5433 in |
| 100 mm | 3.937 in |
| 250 mm | 9.8425 in |
| 500 mm | 19.685 in |
| 1,000 mm | 39.3701 in |
Values are rounded to at most four decimals. The converter above shows more digits.
About the units
One millimeter is 0.001 meters.
One inch is 0.0254 meters.
Need the other direction? Use the Inches to MM converter. For every length unit at once, open the Length Converter.
Frequently asked questions
How many inches are in a millimeter?
There are 0.03937 inches in one millimeter. In the other direction, one inch is 25.4 millimeters.
How do I convert millimeters to inches?
Divide the number of millimeters by 25.4. For example: 25 millimeters ÷ 25.4 = 0.984252 inches.
What is 40 millimeters in inches?
40 millimeters equals 1.5748 inches.