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Square Footage Calculator
Calculate area for rectangles, circles, and triangles. Add multiple rooms and convert units.
Current Shape
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sq ft
Total All Rooms
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sq ft
Current (sq m)
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Total (sq m)
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Need land area calculations or surface facility sizing for oil and gas projects?
Book a free strategy call →How to Calculate Square Footage
Rectangle: Length x Width. A 20 ft x 15 ft room = 300 sq ft.
Circle: pi x r^2. A circle with 10 ft radius = 314.16 sq ft.
Triangle: 0.5 x Base x Height. A triangle with 20 ft base and 12 ft height = 120 sq ft.
To convert square feet to square meters, multiply by 0.0929. Built by Groundwork Analytics.