Foot (ft)
The international foot (ft) is exactly 0.3048 m. Since 2023 the US survey foot is retired, so the international foot is the only US foot.
Symbol: ft
Quantity: length and distance
SI relation: 1 ft = 0.3048 m (exact)
Derivation: 1 ft = 12 in = 0.3048 m (exact)
Exact: yes, by definition
Reference conditions. The international yard and pound agreement (1959) fixed 1 yard = 0.9144 m exactly, so the inch, foot and mile are exact.
History
The US survey foot (1200/3937 m, about 2 ppm longer) was used for land surveying until NIST retired it at the end of 2022.
Typical uses
- Building dimensions and ceiling heights in the US
- Aircraft altitude (flight level 350 = 35 000 ft)
- Person height (feet and inches)
Convert feet to other units
| Conversion | 1 ft equals | Reverse |
|---|---|---|
| foot to meter | 0.3048 m | meter to foot |
| foot to kilometer | 0.0003048 km | kilometer to foot |
| foot to centimeter | 30.48 cm | centimeter to foot |
| foot to millimeter | 304.8 mm | millimeter to foot |
| foot to mile | 0.0001893939394 mi | mile to foot |
| foot to inch | 12 in | inch to foot |
| foot to micrometer | 304800 µm | micrometer to foot |
| foot to nanometer | 304800000 nm | nanometer to foot |
| foot to yard | 0.3333333333 yd | yard to foot |
| foot to nautical mile | 0.0001645788337 nmi | nautical mile to foot |
| foot to angstrom | 3048000000 Å | angstrom to foot |
| foot to mil | 12000 mil | mil to foot |
Open the Length Converter to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "foot (ft)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Foot (ft). Retrieved October 17, 2026, from https://scientificconverters.com/units/foot/
IEEE
Scientific Converters, "Foot (ft)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/foot/