Feet (ft)
The foot (ft) equals 12 inches and is the main building unit in US practice.
- Origin
- An old body-based unit standardized in 1959 as exactly 0.3048 m across English-speaking countries.
- Where it is used
- Used for floor-to-floor heights, spans, room sizes and setting out on US and partly UK construction projects.
- Relation to SI
- 1 ft = 0.3048 m exactly.