Units of Measure / How Many Square Feet in an Acre

How Many Square Feet in an Acre

It is easy to imagine an area of one square foot1. In fact, it is a square which has sides of one foot. But many people have problems with visualizing an acre2, to say nothing of converting square feet to acres. There is a good analogy that helps to envision an acre. It is known that a football field is a bit bigger than one acre. But to clear up the picture, you have to know more facts about square feet and acres.

Square Feet and Acres

These measurements are parts of the US customary system. It has aroused from the English system, but with some differences. Initially, the acre was approximately a parcel of land that an ox was able to plow in one day. Historically, areas of British farms and estates were measured in acres. Even if the area was very large, they did not want to use square miles.

The US customary acre has approximately 4046.87 square meters. In the year of 1959, the length of the international yard was officially defined to be 0.9144 meters. It means that the international acre equals to about 4046.85 square meters. As you see, the difference between the US customary acre and its international variant is so slight, that it all the same what acre to use in everyday life.

How Many Square Feet in an Acre

Now that we know a bit about acres and square feet, we can move to conversion of these units and find out how many square feet there are in an acre. One US customary acre is equivalent to 43 560 square feet, 4840 square yards, or about 4047 square meters.

There are also some other types of acres, used in various countries: Irish acre (7843 yd2), Roman acre (1260 m2), Cheshire acre (10240 yd2), etc.

The table below will help you to convert acres and square feet into some other measurement units.

One square foot
One acre
Square Centimeters
404 687
Square Meters
Square Feet
43 560
Square Yards

  1. Acre is a US customary and imperial unit of area, which is also used in many other systems. The international acre is the most common variant, and it is equal to approximately 4,046.85 square meters, or 0.404 hectare.
  2. Square Foot (abbr. sq ft or ft2) is a US customary and imperial unit of area, which is used in the USA, Unites Kingdom, Canada, India and other countries. It is a square area with sides of one foot (12 inches, or about 0,304 meters).
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