Square Footage Calculator
Calculate area for any shape. Add multiple rooms and convert between units.
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Total Area
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Frequently Asked Questions
How do I calculate square footage? +
For a rectangle, multiply length by width. For a circle, use pi times radius squared. For a triangle, multiply base by height and divide by 2. For a trapezoid, add the two parallel sides, multiply by height, and divide by 2. All measurements should be in the same unit.
How do I convert square feet to square meters? +
To convert square feet to square meters, multiply by 0.0929. To convert square meters to square feet, multiply by 10.764. For example, 100 sq ft = 9.29 sq m, and 100 sq m = 1,076.4 sq ft.
How many square feet are in an acre? +
One acre equals 43,560 square feet, or approximately 4,047 square meters. An acre is roughly the size of a football field without the end zones (which is 48,000 sq ft).
Can I calculate the total area of multiple rooms? +
Yes! This calculator lets you add multiple areas of different shapes. Each area is calculated individually, and a running total is displayed. This is useful for calculating the total floor area of a home or building with multiple rooms.
Is my data stored? +
No. All calculations happen entirely in your browser. Your measurements are never sent to any server or stored anywhere. Your privacy is fully protected.
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