Inchs to millimeters
Convert inchs (in) to millimeters (mm) instantly. 1 inch = 25.4 millimeters.
Quick answer: 1 inch equals 25.4 mm. To convert inchs to millimeters, multiply the value by 25.4.
Good to know
- 1 inch is exactly 2.54 centimetres, and 1 mile is about 1.609 kilometres.
- To estimate miles to kilometres, add half and then a tenth of the miles. 50 miles is about 80 km.
Quick reference
| in | mm |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1270 |
| 100 | 2540 |
Frequently asked questions
How many millimeters are in 1 inch?
There are 25.4 millimeters in 1 inch.
How do I convert inchs to millimeters?
Multiply the number of inchs by 25.4.
How do I convert millimeters back to inchs?
Divide by 25.4, or multiply by 0.0393701.
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