LAND LESSONS- What is an Acre? 

What is an Acre? 
Acre comes from a term used in the Middle Ages meaning how much land a man could plough with a team of oxen during a single day – sun up to sun down. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet), which is exactly equal to 10 square chains, 1⁄640 of a square mile, 4,840 square yards, or 43,560 square feet, and approximately 4,047 m2, or about 40% of a hectare.