Length units at a glance
- 1 inch = 2.54 cm exactly, fixed by international agreement in 1959. Screen sizes are the diagonal in inches.
- 1 foot = 12 inches = 30.48 cm. Heights in the US are given in feet and inches, like 5′9″. Use the height box under the converter for that.
- 1 mile = 1.609344 km. A marathon, 42.195 km, is about 26.2 miles.
- 1 shaku = 10/33 m ≈ 30.3 cm, the traditional Korean and Japanese foot. The Chinese chi (市尺) is 1/3 m, about 33.3 cm.
The quick box understands phrases such as "5 ft 11 in", "5′11″" or "180 cm to ft".