Around the time of the roman empire the terms inch, foot, and yard were refine. what was the length of a foot based on?

http://www.unc.edu/~rowlett/units/custom.html

The clue is in the word.

During the time of the Roman Empire, the measurement of a foot was based on the physical length of a human foot. The concept of using the human body as a standard unit of measurement, called anthropic units, was common in ancient societies. The human foot was considered a practical reference because it was easily reproducible and readily available.

To find out the specific length of a foot during that period, you can refer to historical records, textbooks, or research papers on Roman measurements and ancient units. These sources often provide detailed information about the measurements and standards used by the Romans.

Additionally, you can explore ancient artifacts, such as architectural structures, Roman coins, or inscriptions, which sometimes include measurements and units. By examining these historical artifacts, experts can determine the length of a foot or other units of measurement based on the scale used.

It's important to note that over time, exact standards for units of measurement have evolved, and today's modern standards might differ slightly from those used during the Roman Empire.

12inches equals a foot