Square footage drives flooring, tile, paint and many other estimates. For a simple rectangle it takes one multiplication.
Rectangles
Multiply length by width. A room 12 feet by 10 feet is 120 square feet. In metric, multiply the two sides in metres for square metres.
L-shaped and irregular rooms
Split the space into rectangles, work out each area, and add them together. A room shaped like an L becomes two rectangles. This method handles almost any layout made of straight walls.
Circles and triangles
For a circle, area is pi times the radius squared. For a triangle, it is half the base times the height. Add these to your rectangle total for spaces with curved or angled sections.
Let the tool do it. Square Footage Calculator →
Common questions
How do I find the area of an L-shaped room?
Divide it into two rectangles, calculate each area, then add them.
Should I round measurements up?
Round up slightly so you are never short, especially before buying flooring or tile by the box.
More Calculators
Concrete New
Enter slab dimensions. Result rounds up with a 7 percent waste allowance.
Gravel New
Enter the area dimensions and depth. Result rounds up with a 5 percent waste allowance.
Mulch New
Enter the bed area and depth. Result rounds up with a 5 percent allowance.
Topsoil New
Enter the area and depth. Result rounds up with a 5 percent allowance.
Paint New
Enter total wall area and coats. Result rounds up to whole units.
Flooring New
Enter room area and the coverage printed on the box. 10 percent waste added.
Tile New
Enter the area and one tile size. 10 percent waste added.
Drywall New
Enter total area to cover. 10 percent waste added.
Paver New
Enter the patio size and one paver size. 5 percent waste added.
Sand New
Enter the area and depth. 5 percent allowance added.
Roofing New
Enter the roof surface area. 10 percent waste added. Three bundles per square.
Insulation New
Enter area to cover and the coverage printed on the package. 5 percent added.
Fence New
Enter total fence length and post spacing.
Sod New
Enter the area to cover. 5 percent allowance added.
Grass Seed New
Enter area and seeding rate. Default rates suit a new lawn.
Fertilizer New
Enter area, target nitrogen rate and the first number on the bag.
Cubic Yards New
Enter length, width and depth. No waste added.
Square Footage New
Enter length and width.
Board Foot New
Enter board dimensions and quantity.
Material Cost New
Enter quantity, unit price, tax and delivery. Figures are in your own currency.