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US Standard Area

These are the most common measurements:

  • Square Inch
  • Square Foot
  • Square Yard
  • Acre
  • Square Mile

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

squareArea 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.

The Unit is foot × foot, which can be written many ways, such as

  • ft2
  • foot2
  • sq ft
  • sq foot
  • sq feet
  • etc ...

Acre

One acre is equal to 43,560 square feet

Square Mile

A square mile is a square that is 1 mile on each side.

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 208.71 feet, or 69.7 yards
  • about 0.4 hectare (40% of the area of a hectare)

A square mile is:

  • 640 acres