Find the area of a room, a plot of land or any flat surface. Choose a rectangle, circle or triangle, enter the measurements, and get the answer in square feet, square metres, square yards and acres — plus an optional cost at a price per unit of area.
Formula
Rectangle: L × W · Circle: π × d² ÷ 4 · Triangle: base × height ÷ 2
For L-shaped rooms, split the floor into rectangles, calculate each, and add them up.
Worked example
A 15 × 12 ft room is 180 ft², which is 20 square yards or about 16.72 m².
Frequently asked questions
How do I calculate square footage?
Multiply the length by the width in feet. A room 10 ft by 14 ft is 140 square feet.
How do I convert square feet to square metres?
Multiply by 0.0929, or divide by 10.764. 180 ft² ≈ 16.72 m².
Last updated · Calculations checked by automated tests· Editorial policy