Enter a value in one of the fields to convert inches to millimeters:
To calculate the length in millimeters you multiply the length in inches by 25.4:
The inch is a unit of length for measuring small distances, primarily used in the USA. It equals 1/12 of a foot and 2.54 centimeters.
The millimeter is an international unit for measuring very small lengths. It equals 0.001 meters and 0.1 centimeters.
| Inches | Millimeters | |
|---|---|---|
| Marathon | 1,661,220.5 | 42,195,000.0 |
| Race track "Mille Miglia" | 63,358,267.7 | 1,609,300,000.0 |
| Earth radius | 251,108,858.3 | 6,378,165,000.0 |
| Earth circumference | 1,577,763,464.6 | 40,075,192,000.0 |
| Distance earth ↔ moon | 15,133,858,267.7 | 384,400,000,000.0 |
| Distance earth ↔ sun | 5,889,518,897,637.8 | 149,593,780,000,000.0 |