Last updated: May 2026
Convert any length or distance unit instantly — metric (mm, cm, m, km) to imperial (in, ft, yd, mi) and back.
Convert between metric (mm, cm, m, km) and imperial (in, ft, yd, mi)
Common Length References
| Metric | Imperial | Context |
|---|---|---|
| 1 cm | 0.394 in | Width of a fingernail |
| 30.48 cm | 1 ft | Standard foot |
| 1 m | 3.281 ft | Slightly longer than a yard |
| 1 km | 0.621 mi | About 12 city blocks |
| 5 km | 3.107 mi | 5K race distance |
| 42.195 km | 26.219 mi | Marathon |