"Regular" feet are used to measure how long something is, like a rope,
or how far something is, like the house down the street.
You can't use those at all to measure how much paint you need for a wall,
or how much rug you need for a floor.
To do that kind of measurements, you need a new kind of unit, like "square feet".
They're completely different from regular feet. You can't change one into the other.
I don't care how many feet long a piece of string is ... you can't cover a floor with it.
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400 square ft = 37.16 square m
400 square meters is 4,305.56 square feet.
400 square feet (20 x 20 = 400)
400 sq cm equals 0.43 square feet.
20 x 20 = 400 The room has 400 square feet on the floor, 400 square feet on the ceiling, and (80 x height of the room) square feet on the walls.