Square Footage Calculator
Find area in square feet for rectangles, circles, and triangles. Also shows square meters, square yards, and acres.
Shape & dimensions
Area
180 sqft
Square meters
16.72 m²
Square yards
20 sq yd
Acres
0.00413
Frequently Asked Questions about the Square Footage Calculator
How do I calculate square footage?
For rectangles: length x width. For circles: pi x (diameter/2)^2. For triangles: (base x height) / 2. All measurements in feet.
How big is 1 acre?
1 acre = 43,560 square feet, which is roughly a square 209 ft on each side, or about 75% of an American football field.
How do I convert sqft to square meters?
Multiply by 0.0929. So 1,000 sqft equals about 92.9 square meters.
Should I measure irregular rooms in sections?
Yes. Break L-shaped or odd rooms into rectangles, calculate each, then sum them up. This is more accurate than guessing one big rectangle.
Is square footage measured from inside or outside walls?
For real estate, livable square footage is measured from the inside of exterior walls. Gross building area uses outside dimensions. This calculator works with whatever measurements you input.