Square Footage
Area for rectangles, circles, triangles
About Square Footage
Square footage tells you how much floor area a room or property has. Buyers, renters, contractors, and tax assessors all care — and they don't always agree on how to measure, because what counts (closets? finished basements? exterior vs. interior walls?) varies by purpose.
Frequently asked questions
Heated, finished, above-grade space with ceilings ≥ 7 feet. Basements are reported separately even when finished; garages don't count.
ANSI Z765 (the US standard for single-family homes) uses exterior; appraisers and listings follow this. Architectural drawings use interior. Always confirm which standard a number refers to.
Split it into rectangles, compute each, and add. Same approach for any irregular shape — bays, alcoves, nooks all get their own rectangle.
The footprint counts on both floors — it's not subtracted from upstairs. Some appraisers count the stair area; others count only the landing.
5-10% is common between MLS, tax records, and a fresh measurement. For a high-stakes deal, hire a professional appraiser.
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