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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.
How many boxes of flooring for a 12x12 room?
Pick a material and layout to see how many boxes to buy, waste included. Box coverage varies by brand, so adjust the sq ft per box to match the label on yours.
Need a cost estimate too? Use the full flooring calculator.
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.