Calculators

Square Footage Calculator

Pick a shape and enter its measurements in feet. For an L-shaped room or an odd lot, split it into simple shapes and add up the results.

Shape
ft
ft
$/sq ft
Area 180.00 sq ft
Square yards
20.00 sq yd
Square meters
16.72 m²
Acres
0.00413
Cost
—
L × W π × (D ÷ 2)² B × H ÷ 2
The three basic shapes. Split odd shapes into these and add the results.

Formulas

Rectangle = length × width
Circle = π × (diameter ÷ 2)²
Triangle = base × height ÷ 2

Measurements in feet and inches? Divide the inches by 12 first: 10 ft 6 in is 10.5 ft. Carpet and some flooring are priced per square yard, which is 9 sq ft. An acre is 43,560 sq ft.

For flooring, add 5–10% for cuts. Use 15% for diagonal layouts or patterned tile.