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What is a square unit? Or more precisely, what is 1 square unit? A square unit or 1 square unit is equal to the area of a square having a side length of 1 unit. The figure below shows a square that has an area of 1 square unit.

The square unit can also be written as sq unit or unit^{2}

In the metric system of measurement, some commonly used square units are square centimeter (cm^{2}), square meter (m^{2}), and square kilometer (km^{2}).

In the United States customary system, some commonly used square units are square foot (ft^{2}), square inch (in.^{2}), and square mile (mi^{2}).