12 inches
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My foot is actually about 1 foot long!
A long time ago a king wanted to see how long his foot was. His foot was exactly 12 feet long so he called that a foot.
A five dollar "foot long sub" and a ruler
AnswerThe volume of a box one foot long, one foot high, and one foot wide is 1 foot3 or 7.480519 liquid gallons.
the foot was a measurement of the king's foot, which happened to be 12 inches long. Thus 1 foot = 12 inches.