foot [ft] Unit Converter

Definition of foot [ft] unit

A foot is a unit of length equal to 12 inches. In the modern international system, one foot is defined exactly as 0.3048 meter. It is commonly abbreviated as ft or written with the symbol ′.

History of foot [ft] unit

The foot is one of the oldest human measures, probably based on the length of an adult human foot. Ancient Egyptian, Greek, and Roman cultures used related units, although their exact values differed. In medieval Europe, local feet varied considerably, creating difficulties in trade and surveying. England gradually standardized its foot through customary practice, and the 1959 international agreement fixed it at exactly 0.3048 meter. This definition remains authoritative today, while historical feet survive in archaeology and discussions of traditional measurement systems.

Applications of foot [ft] unit

The foot remains widely used in the United States for everyday distances, height, construction, and real-estate measurements. It also appears in aviation altitude reporting, especially in countries following international conventions. Examples include a six-foot person, a ten-foot room, or a 1,000-foot runway. In scientific work, however, meters are generally preferred.

Complete list of foot [ft] unit conversion