Convert Millimeter to Inch
Convert Millimeter to Inch instantly. 1 mm = 0.03937 in. Formula, worked examples and a quick reference table.
Last updated
One millimeter equals 0.03937 inch. To convert any number of millimeters to inchs, multiply by 0.03937008.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Millimeter to Inch formula
To go the other way, use millimeter = inch ÷ 0.03937008.
About these units
The inch has been defined as exactly 25.4 millimetres since the 1959 international yard and pound agreement, which finally reconciled slightly different British and American definitions.
Millimeter to Inch conversion table
| Millimeter | Inch |
|---|---|
| 1 mm | 0.0394 in |
| 2 mm | 0.0787 in |
| 3 mm | 0.1181 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 |
| 100 mm | 3.937 in |
| 250 mm | 9.8425 in |
| 500 mm | 19.685 in |
| 1,000 mm | 39.3701 in |
Frequently asked questions
How many inchs are in a millimeter? +
There are 0.03937 inchs in one millimeter.
What is 10 mm in in? +
10 mm equals 0.3937 in. Multiply 10 by 0.03937008.
How do I convert inch back to millimeter? +
Use millimeter = inch ÷ 0.03937008. The converter above handles both directions, or see our dedicated Inch to Millimeter page.