Millimeters to inches
1 millimeter equals 0.03937 inches. Multiply millimeters by 0.03937 to get inches, or divide by 25.4.
| Millimeters | Inches | Nearest 1/16 in |
|---|---|---|
| 1 | 0.0394 | 1/16″ |
| 2 | 0.0787 | 1/16″ |
| 3 | 0.1181 | 1/8″ |
| 4 | 0.1575 | 3/16″ |
| 5 | 0.1969 | 3/16″ |
| 6 | 0.2362 | 1/4″ |
| 8 | 0.315 | 5/16″ |
| 9 | 0.3543 | 3/8″ |
| 10 | 0.3937 | 3/8″ |
| 12 | 0.4724 | 1/2″ |
| 12.7 | 0.5 | 1/2″ |
| 15 | 0.5906 | 9/16″ |
| 20 | 0.7874 | 13/16″ |
| 25 | 0.9843 | 1″ |
| 30 | 1.1811 | 1 3/16″ |
| 40 | 1.5748 | 1 9/16″ |
| 50 | 1.9685 | 1 15/16″ |
| 100 | 3.937 | 3 15/16″ |
| 200 | 7.874 | 7 7/8″ |
| 300 | 11.811 | 11 13/16″ |
Unit converter
What to know
The inch has been defined as exactly 25.4 mm since the 1959 international yard and pound agreement, so every length conversion here is exact before rounding.
Questions people ask
How do I convert millimeters to inches?
Multiply by 0.03937. For example, 10 mm = 0.3937 in.
How many inches are in a millimeter?
0.03937.
Related sizes
Sources and method
Imperial and metric values are converted with 1 in = 25.4 mm exactly and rounded only for display. Found a mistake? Report it and we will correct the page.