Inches to MM
1 Inches = 25.4 Millimeters
| Millimeters | 25.4 |
| Centimeters | 2.54 |
| Meters | 0.0254 |
| Kilometers | 0.0000254 |
| Feet | 0.0833333333 |
| Yards | 0.0277777778 |
| Miles | 0.0000157828 |
| Nautical miles | 0.0000137149 |
Inches to millimeters table
| Inches (in) | Millimeters (mm) |
| 0.1 in | 2.54 mm |
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 7 in | 177.8 mm |
| 8 in | 203.2 mm |
| 9 in | 228.6 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 30 in | 762 mm |
| 40 in | 1,016 mm |
| 50 in | 1,270 mm |
| 75 in | 1,905 mm |
| 100 in | 2,540 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
How to convert inches to millimeters
- Enter the amount in inches above; the result in millimeters updates as you type.
- To do it by hand, multiply by 25.4. One inch is 25.4 millimeters.
- Example: 10 in × 25.4 = 254 mm.
Frequently asked questions
How many millimeters are in one inch?
One inch is 25.4 millimeters.
How do I convert millimeters back to inches?
Divide by 25.4, or multiply by 0.03937008. Use the swap button above to flip the conversion.
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