Inches to Millimeters Converter
Convert inches to millimeters instantly.
Standard length units
Fun comparisons
How to convert inches to millimeters
Enter your value in inches and see the result in millimeters instantly. The converter also shows fun real-world comparisons - like the height of famous buildings or the length of football fields - to help you picture the distance.
Inches are the US standard for drill bits, hardware and screen sizes; millimeters are used for the same measurements in metric countries. This conversion is one of the most common in workshops and hardware stores.
Need the opposite direction? Convert millimeters to inches just as easily, or explore all our length conversions.
Common inches to millimeters conversions
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 | 25.4 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1270 |
| 100 | 2540 |
| 500 | 12700 |
| 1000 | 25400 |
Frequently asked questions
1 inches equals 25.4 millimeters.
Multiply by 25.4. For example, 5 in = 127 mm.
A 1/4 inch drill bit equals exactly 6.35 millimeters.
1 millimeters equals 0.0393701 inches.
100 inches equals 2540 millimeters.