Inches to Millimetres converter
1 in = 25.4 mm. Type a value in either box to convert instantly.
How to convert inches to millimetres
1 inch equals 25.4 millimetres. To convert inches to millimetres, multiply the value by 25.4. To go the other way, divide by 25.4 (1 mm = 0.03937 in).
The inch (in) is exactly 2.54 centimetres. There are 12 inches in a foot. The millimetre (mm) is one thousandth of a metre. In American English it is spelled “millimeter”.
Common conversions
- 0.5 inches in millimetres is 12.7 mm.
- 1 inches in millimetres is 25.4 mm.
- 2 inches in millimetres is 50.8 mm.
- 12 inches in millimetres is 304.8 mm.
in to mm conversion table
| Inches (in) | Millimetres (mm) |
|---|---|
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 0.75 in | 19.05 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 |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
Questions and answers
How many millimetres are in one inch?
There are 25.4 millimetres in one inch.
How do I convert millimetres back to inches?
Multiply by 0.03937, or use the Millimetres to Inches converter.
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