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๐Square Footage Calculator
Formulas
- Rectangle = length ร width
- Circle = ฯ ร (diameter รท 2)ยฒ
- Triangle = base ร height รท 2
- 1 sq yd = 9 sq ft ยท 1 mยฒ = 10.7639 sq ft ยท 1 acre = 43,560 sq ft
When buying flooring, sod or carpet, add 5โ10% for cuts and waste. Real estate listings in the U.S. usually measure finished living area and exclude garages and unfinished basements.
Frequently asked questions
How do I calculate square footage of a room?
Measure length and width in feet and multiply. A 12 ft ร 15 ft room is 180 sq ft. For inches, divide by 12 first: 10 ft 6 in = 10.5 ft.
How do I measure an L-shaped room?
Split it into two rectangles, find each area and add them. Use the 'Add another area' button below.
How many square feet are in an acre?
43,560 square feet. A square yard is 9 square feet and a square meter is about 10.764 square feet.
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Last reviewed: 2026-10-17