In Roman times the length of a foot was called a pes. The pes consisted of 12 unicae. (like our 12 inches to a foot) So the Roman foot was based on the unica, just as our foot is based on the inch. However the length measurements of the Romans were slightly shorter than ours. That is, a unica = .97 of our inch and a pes = 11.6 inches instead of our 12 inches.
your forearm
The length of an average male foot.
as he name says, it was based on a human foot
The foot BEE-OTCH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
based on paces
The length of a Roman foot, which was called a "pes", was based on the "unciae" which was the Roman inch. Twelve unciae equalled one Roman foot, just as in our measurements twelve inches equals one foot.
The length of three hands.
This may sound very strange, but the answer is anyone's foot!
A foot was based on the size of Hercules's foot
The Roman foot was based off of the Roman inch, just as our feet and inches are related. However the Romans had nothing as simple as our inch, foot, yard, mile measurement. They had several length measurements before they finally reached the term for the Roman mile. The Roman foot was 12 unicae, (inches) and was called a pes. Five pedes (plural of pes) was 1 passus. 1000 passus was a mile.
Early measurement units, such as the foot, were based on the size or length of a body part. For example, a foot was the approximate length of a man's foot. Over time, different people changed the exact measurement, such as kings making their feet the standard foot size. The Imperial measurement system (and now the US Customary system) defines a foot as 12 inches.
A roman foot is 296.2 mm