1 mm is 0.0394 inches and 10 mm is 0.394 inches. One inch is exactly 25.4 mm.
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 | 0.039 |
| 2 | 0.079 |
| 3 | 0.118 |
| 4 | 0.157 |
| 5 | 0.197 |
| 6 | 0.236 |
| 7 | 0.276 |
| 8 | 0.315 |
| 9 | 0.354 |
| 10 | 0.394 |
| 11 | 0.433 |
| 12 | 0.472 |
| 13 | 0.512 |
| 14 | 0.551 |
| 15 | 0.591 |
| 16 | 0.630 |
| 17 | 0.669 |
| 18 | 0.709 |
| 19 | 0.748 |
| 20 | 0.787 |
| 21 | 0.827 |
| 22 | 0.866 |
| 23 | 0.906 |
| 24 | 0.945 |
| 25 | 0.984 |
| 26 | 1.024 |
| 27 | 1.063 |
| 28 | 1.102 |
| 29 | 1.142 |
| 30 | 1.181 |
| 31 | 1.220 |
| 32 | 1.260 |
| 33 | 1.299 |
| 34 | 1.339 |
| 35 | 1.378 |
| 36 | 1.417 |
| 37 | 1.457 |
| 38 | 1.496 |
| 39 | 1.535 |
| 40 | 1.575 |
How it is computed
Inches = millimeters ÷ 25.4. Three decimals keep the precision a caliper or drill chart needs.
FAQ
Which inch fraction is closest to a metric size?+
Multiply the inches by 16 (or 32) and round: 10 mm is 0.394 in, about 6.3/16, so close to 3/8 in. The inch fractions table lists the exact values.
How do I convert inches to mm?+
Multiply by 25.4. For example, ¼ in is 6.35 mm.