How to Calculate Square Footage
Rectangle: Area = Length × Width
Circle: Area = π × Radius²
Triangle: Area = ½ × Base × Height
Trapezoid: Area = ½ × (Side A + Side B) × Height
Area Unit Conversions
- 1 sq ft = 0.0929 sq m = 144 sq inches
- 1 sq m = 10.764 sq ft
- 1 sq yd = 9 sq ft
- 1 acre = 43,560 sq ft
Frequently Asked Questions
How do I measure an irregular room? Break it into rectangles and triangles, calculate each area separately, then add them together.
What is the average home size? The average new US home is about 2,300 sq ft. Apartments average 900-1,000 sq ft.