How it's calculated
Rectangle A = L × W ; Triangle = ½ b h ; Circle = π r² ; Trapezoid = ½ (b₁ + b₂) h
A = area; L,W = length and width; b = base, h = height; r = radius; b₁,b₂ = parallel sides. Output is converted to ft², m², yd², in² and acres.
Common questions
How do I find the square footage of a room?
For a rectangular room, multiply the length by the width in feet. A 12 ft by 10 ft room is 120 square feet.
Can I mix units like feet and inches?
Convert each dimension to the same unit first. This tool lets you enter inches, yards, meters, or centimeters and handles the conversion for you.