DistanceMillimeters to inches
1 millimeter = 0.03937 inches.
1 millimeter = 0.03937 inches. Multiply by 0.03937.
Common amounts
| mm | in |
|---|---|
| 1 mm | 0.03937 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.393701 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.937 in |
How it works
How to convert millimeters to inches
in = mm × 0.03937.
Worked examples: 10 millimeters = 0.3937 inches; 100 millimeters = 3.937 inches.
About millimeters and inches
A millimeter is one thousandth of a meter. Since 1959 the international inch is defined as exactly 2.54 cm.
When you'd convert millimeters to inches
Bolt sizes, rainfall and lens focal lengths: 25.4 mm is exactly one inch.
Common mistake: rounding too early. Keep the full factor and round only the final answer.
The converter on this page works out the answer in your browser as you type, and shows the factor so you can check it by hand.
Questions
How do I convert millimeters to inches?
1 millimeter = 0.03937 inches. Multiply by 0.03937.
What does the Converter : Units app add?
The same conversion, plus history, a constants library, and the rest of the unit categories on the phone.