Inches to Millimetres Converter
Enter inches to get millimetres instantly. Works both ways.
1 inch = 25.4 millimetres
How to convert inches to mm
To convert inches to millimetres, multiply by 25.4. For example, 5 inches × 25.4 = 127 mm.
Need it the other way? Convert millimetres to inches.
Inches to mm chart
| Inches | Millimetres |
|---|---|
| 0.1 inches | 2.54 mm |
| 0.25 inches | 6.35 mm |
| 0.5 inches | 12.7 mm |
| 1 inches | 25.4 mm |
| 2 inches | 50.8 mm |
| 3 inches | 76.2 mm |
| 4 inches | 101.6 mm |
| 5 inches | 127 mm |
| 6 inches | 152.4 mm |
| 7 inches | 177.8 mm |
| 8 inches | 203.2 mm |
| 9 inches | 228.6 mm |
| 10 inches | 254 mm |
| 15 inches | 381 mm |
| 20 inches | 508 mm |
| 25 inches | 635 mm |
| 30 inches | 762 mm |
| 40 inches | 1,016 mm |
| 50 inches | 1,270 mm |
| 75 inches | 1,905 mm |
| 100 inches | 2,540 mm |
| 250 inches | 6,350 mm |
| 500 inches | 12,700 mm |
| 1,000 inches | 25,400 mm |
More length conversions
Frequently asked questions
How many millimetres are in one inch?
There are 25.4 millimetres in one inch.
How do I convert inches to mm?
Multiply the value in inches by 25.4.