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The **square foot** (plural **square feet**; abbreviated sq. ft, sf, or ft^{2}; also denoted by '^{2}) is an imperial unit and U.S. customary unit (non-SI, non-metric) of area, used mainly in the United States and partially in Canada, the United Kingdom, Bangladesh, India, Nepal, Pakistan, Ghana, Liberia, Malaysia, Myanmar, Singapore and Hong Kong.^{[citation needed]} It is defined as the area of a square with sides of 1 foot.

Although the pluralization is regular in the noun form, when used as an adjective, the singular is preferred. So, an apartment measuring 700 square feet could be described as a 700 square-foot apartment^{[citation needed]}. This corresponds to common linguistic usage of *foot.*

The square foot unit is commonly used in real estate.^{[1]} Dimensions are generally taken with a laser device, the latest in a long line of tools used to gauge the size of apartments^{[2]} or other spaces. Real estate agents often measure straight corner-to-corner, then deduct non-heated spaces, and add heated spaces whose footprints exceed the end-to-end measurement.^{[3]}

**1 Square foot conversion to other units of area:**

- 1 square foot (ft²) = 0.000022956341 acres (ac)
- 1 square foot (ft²) = 0.000009290304 hectare (ha)
- 1 square foot (ft²) = 0.09290304 square meters (m²)
- 1 square foot (ft²) = 144.0000002229 square inches (in²)
- 1 square foot (ft²) = 0.111111106982 square yards (yd²)
- 1 square foot (ft²) = 929.0304014422 square centimeters (cm²)
- 1 square foot (ft²) = 9.290304 square decimeters (dm²)
- 1 square foot (ft²) = 0.00000009290304 square kilometers (km²)
- 1 square foot (ft²) = 144003673094580 square microinches (µin²)
- 1 square foot (ft²) = 92903040000 square micrometers (μm²)
- 1 square foot (ft²) = 0.0000000358701 square miles (mi²)
- 1 square foot (ft²) = 92903.04 square millimeters (mm²)