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What is the sq ft of a 20x20 room?

A 20x20 room is 400 square feet. The math is simple: 20 feet x 20 feet = 400 sq ft. That's a large room by residential standards, roughly the size of a two-car garage, which is typically 20x20 or 20x22.

For context, 400 sq ft can comfortably hold a full living room arrangement with multiple seating areas, or serve as a spacious primary bedroom with a sitting area. If you're pricing flooring for a 400 sq ft space, budget for 420-440 sq ft of material to cover cuts and waste.

As with any room, the stated dimensions assume a perfect rectangle. Real rooms have closets, bump-outs, and angled corners that change the true area. When you need the exact number rather than the nominal one, tracing the actual room outline on a floor plan gives you the precise area. MeasureFloorPlan calculates this automatically for any room shape once you've set the drawing's scale, which matters when you're ordering materials or verifying a listing's square footage claim.