Inches to Millimetres Converter
Convert inches to millimetres instantly. One inch equals 25.4 millimetres, so you can type any value in in and read the answer in mm. The page also…
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Convert inches to millimetres instantly. One inch equals 25.4 millimetres, so you can type any value in in and read the answer in mm. The page also shows a conversion table and the exact formula used.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
1 in = 25.4 mm
With the default inputs (value in inches = 1 in), the results are: millimetres 25.4 mm.
Inches to millimetres conversion table
Reference table based on the example values; it is not your calculation result.
| inches (in) | millimetres (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1,270 |
| 100 | 2,540 |
| 500 | 12,700 |
| 1,000 | 25,400 |
Frequently asked questions
How many millimetres are in one inch?
1 inch = 25.4 millimetres.
What is the formula to convert inches to millimetres?
Multiply the value in inches by 25.4.
How do I convert millimetres back to inches?
1 millimetre = 0.0393701 inches.
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