Square Footage Calculator

Split it into rectangles, calculate each, and add them — every estimator does it this way. The L-shape mode here is exactly that with two rectangles; for a more complex floor plan, run each rectangular chunk separately and sum. Measure at floor level along the walls, and don't subtract for doorways or built-ins unless the flooring genuinely won't go there.

5–10% over the measured area for straight-lay plank and carpet, 10–15% for tile or anything laid diagonally — cuts, breakage, and pattern matching consume it, and dye lots vary enough that a later top-up order may not match. The tile calculator builds waste directly into its counts.

Not quite — listed square footage follows appraisal standards (typically finished, heated, above-grade space measured from exterior walls), so it includes wall thickness and excludes garages and unfinished basements. Room-by-room interior measurements like these will total less than the listing number for the same house. For materials, your interior measurements are the ones that matter.

Divide square feet by 9 for square yards (carpet is often quoted per sq yd — a 12×15 room is 180 sq ft = 20 sq yd), and multiply by 0.0929 for square meters. The calculator shows all three so you can compare quotes in whatever unit the contractor used.