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The foot is a standard unit - but of the Imperial system.
A foot is a unit of length. A square foot is a unit of area. The two units are therefore incompatible.
A foot is a unit of length, equivalent to 0.3048 meters.
foot (ft) - unit of distance
square foot (ft2) - unit of area
mph is a unit of speed; pounds per square foot is a unit of pressure. You don't convert that.mph is a unit of speed; pounds per square foot is a unit of pressure. You don't convert that.mph is a unit of speed; pounds per square foot is a unit of pressure. You don't convert that.mph is a unit of speed; pounds per square foot is a unit of pressure. You don't convert that.