Area of a space
Enter length and width.
ft
ft
m
m
Square feet
-sq ft
Square yards
-sq yd
Square metres
-m²
area = length × width
Square metres
-m²
Square feet
-sq ft
area = length × width
Estimate only. For L-shapes, add the area of each rectangle. Confirm the final quantity with your supplier before ordering.
How to calculate square footage
Area is length times width. For a rectangle that is all you need. For an L shaped or irregular space, split it into rectangles, work out each one, and add them together. Round measurements up slightly so you are never short. Square footage feeds flooring, tile, paint and many other estimates.
Measuring a room? A laser distance measure is faster and more accurate than a tape for wall to wall spans.
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Common questions
How do I calculate square footage?
Multiply length by width in feet. A 12 by 10 foot room is 120 square feet.
How do I find the area of an L shaped room?
Divide it into two rectangles, calculate each area, then add them. This works for any shape made of rectangles.
More Calculators
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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.
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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.
Board Foot New
Enter board dimensions and quantity.
Material Cost New
Enter quantity, unit price, tax and delivery. Figures are in your own currency.