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How many square feet is a 12x12 room floor?

A 12x12 room is 144 square feet. Multiply the length by the width: 12 feet x 12 feet = 144 sq ft. This applies to the floor area inside the walls, which is what matters for flooring, paint coverage estimates, and furniture planning.

Keep in mind that a "12x12 room" is rarely a perfect square in practice. Closets, wall notches, bay windows, and door alcoves all change the true usable area. If you're ordering flooring, most installers recommend adding 5-10% for waste and cuts, so plan for roughly 150-160 sq ft of material for a 144 sq ft room.

If you're working from a floor plan rather than a physical room, you can get the exact area including any irregular shapes by tracing the room outline in a tool like MeasureFloorPlan, which calculates the true area automatically once the drawing's scale is set. That's more accurate than length-times-width for any room that isn't a clean rectangle.