US Standard Area
These are the most common measurements:
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Small surfaces are usually measured in square inches, rooms and buildings in square feet, carpet in square yards, property in acres, and territory in square miles.
Square Inch
Area is length by length, so a square inch is a square that is 1 inch on each side.
The Unit is inch × inch, which can be written many ways, such as:
- in2
- inch2
- sq in
- sq inch
- square inch
- etc ...
Square Foot
A square foot is a square that is 1 foot on each side.
Here Ariel the Dog sits next to a square foot made with tape measures.
The Unit is foot × foot, which can be written many ways, such as
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Square Yard
A square yard is a square that is 1 yard on each side. It is equal to 9 square feet.
Acre
One acre is equal to 43,560 square feet.
Acres are commonly used to measure land.
Square Mile
A square mile is a square that is 1 mile on each side.
Square miles are commonly used to measure large areas of land.
More Examples
A square inch is about:
- 6½ square centimeters
An acre is:
- 4,840 square yards
- 43,560 square feet
- a square with sides about 208.71 feet or 69.57 yards
- about 0.4 hectare (40% of the area of a hectare)
A square mile is:
- 640 acres