Inches to Millimeters Converter
1 Inch = 25.4 Millimeters
in
mm
1 in = 25.4 mm. To convert inches to millimeters, multiply by 25.4; to convert back, multiply by 0.0393701.
Conversion formula
1 in = 25.4 mm
To convert from Inches to Millimeters, multiply the value in inches by 25.4.
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.001 | 0.0254 |
| 0.01 | 0.254 |
| 0.1 | 2.54 |
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1,270 |
| 100 | 2,540 |
| 250 | 6,350 |
| 500 | 12,700 |
| 1000 | 25,400 |
1 inch in every length unit
| Meters | 0.0254 m |
| Kilometers | 0.0000254 km |
| Centimeters | 2.54 cm |
| Millimeters | 25.4 mm |
| Micrometers | 25,400 um |
| Nanometers | 25,400,000 nm |
| Miles | 0.0000157828 mi |
| Yards | 0.0277778 yd |
| Feet | 0.0833333 ft |
| Nautical Miles | 0.0000137149 nmi |
| Light Years | 2.68478e-18 ly |
Frequently Asked Questions
How many millimeters are in 1 inch?
1 inch equals 25.4 millimeters. So 10 inches are 254 millimeters and 100 inches are 2,540 millimeters.
How do I convert inches to millimeters by hand?
Multiply the number of inches by 25.4. To go the other way, multiply millimeters by 0.0393701 (or divide by 25.4).
How many inches are in 1 millimeter?
1 millimeter equals 0.0393701 inches.