General
Square Footage Calculator
Calculate the square footage of rectangular, circular, triangular, or L-shaped areas.
For odd-shaped areas, break the space into simple shapes (rectangles, triangles, circles), calculate each one, and add them together. Measure to the nearest inch for the most accurate results.
Common Questions
How do I calculate square footage of a room?
Multiply the room length by the width in feet. A 12 by 15 foot room is 180 square feet. For L-shaped rooms, break the area into rectangles, calculate each one, and add them together.
How do I convert square feet to square yards?
Divide square feet by 9. For example, 900 square feet equals 100 square yards. Carpet and some flooring are sold by the square yard.
How do I find the square footage of a circle?
Multiply pi (3.14159) by the radius squared. If the diameter is 20 feet, the radius is 10 feet, and the area is 3.14 times 100 which equals 314 square feet.
How do I measure an odd shaped room?
Break the area into simple shapes like rectangles, triangles, and half-circles. Measure and calculate each shape separately, then add them all together for the total.
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