How many square feet are there per acre?

There are 43,560 square feet in an acre. An acre is a measure of land area in Imperial units, and a square foot is the area enclosed by a square with each side being 1 foot long.

The acre has Middle English origins in the word "aker" or the Latin word "ager". It was originally defined as an area that could be plowed in one day with a yoke of oxen pulling a wooden plow. It later came to denote it's modern day representation of any strip of land measuring 4,840 square yards, 160 square rods or 4,047 square meters.