What is the foot unit of length defined as today?
Since the international yard and pound agreement of July 1959, one foot is defined as exactly 0.3048 meters. This definition applies in the United States and countries of the Commonwealth of Nations.
Questions about Foot (unit)
Short answers, pulled from the story.
How many inches are in a foot?
One foot comprises 12 inches in both the British imperial and United States customary systems of measurement. Three feet make one yard.
What countries still use the foot as a unit of measurement?
The United States is the only industrialized country that uses the foot in preference to the meter in commercial, engineering, and standards activities. The foot is legally recognized in the United Kingdom and is an alternative expression of length in Canada. In international aviation, altitude is measured in feet worldwide.
Why did historical feet vary so much in length between countries?
Before metric standardization, each city or region defined the foot independently, often based on local traditions or trade conventions. The resulting lengths ranged from 273.8 mm in Ypres, Belgium, to 347.73 mm in Venice. Germany alone had dozens of different feet because the region was divided into many kingdoms, principalities, and free cities before unification in 1871.
What is the US survey foot and when was it deprecated?
The US survey foot was a definition of the foot used for American surveying data that predated the 1959 international agreement. It differed from the international foot by 2 parts per million, which is negligible over short distances but significant across large coordinate systems. The National Institute of Standards and Technology officially deprecated the US survey foot on the 31st of December 2022.
What evidence is there that a Neolithic long foot was used at Stonehenge?
Archaeologists Mike Parker Pearson and Andrew Chamberlain proposed the Neolithic long foot based on surveys of Phase 1 elements at Stonehenge, where stone circle diameters appear to be consistent multiples of 30 long feet. One long foot equals 1.056 modern international feet, or about 12.672 inches. The same unit appears in the Folkton Drums from Yorkshire and the Lavant drum from Sussex, Neolithic chalk artifacts whose circumferences divide exactly as integers into ten long feet.