Blog
Guides, formulas, and worked examples from the Square Footage Calculator.
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How to Measure Square Footage (Any Room, House, or Space)
To measure square footage, multiply length by width. Learn the formula, how to measure irregular rooms, a house, flooring, and land, and how to convert to m2, yd2, and acres.
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What Counts as Square Footage in a House?
Square footage counts finished, heated, above-grade space under the ANSI Z765 standard. See what counts (and what does not): basements, garages, stairs, attics, and why Zillow differs.
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How Much Flooring Do I Need? Square Footage Guide
Calculate flooring by measuring room square footage, adding a 5 to 10 percent waste factor, then dividing by the coverage per box. Formula and worked example.
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How to Calculate the Square Footage of a House
To calculate a house's square footage, measure each floor's exterior and add them. A 30x40-ft two-story house is 2,400 sq ft. Steps for two-story, L-shaped, and multi-level homes.