Square Footage Calculator
Calculate the area of rectangular, circular or triangular spaces in square feet — and the cost when you know the price per square foot.
Area
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In square meters —
Total cost —
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How it works
Rectangle: L × W; circle: πr²; triangle: ½ × base × heightFrequently Asked Questions
How do I calculate square footage of a room?
Multiply length by width in feet: a 12 × 15 ft room is 180 sq ft. For L-shaped rooms, split into rectangles and add the areas.
How many square feet is my house?
Sum the finished, heated floor area of every level measured from exterior walls — garages, unfinished basements and open porches are excluded from the standard figure.
How do I convert square feet to square meters?
Divide by 10.764: a 1,500 sq ft home is about 139 m². The calculator shows both units.