Support: Square Footage Calculator
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Common questions
How do I calculate square footage?
Multiply the length by the width, both in feet. A room 12 feet by 10 feet is 120 square feet. If a measurement has inches, turn them into a fraction of a foot first by dividing by 12: 10 feet 6 inches is 10.5 feet. The calculator does that conversion for you.
How do I measure an L-shaped room?
Split it into two rectangles that do not overlap, measure each one and add the two areas. Press Add another area for the second rectangle.
How many square feet are in a square yard?
Nine, because a yard is 3 feet and 3 × 3 = 9. Divide square feet by 9 to get square yards.
How do I convert square feet to square metres?
Multiply by 0.0929, or divide by 10.764. The calculator shows both at once, and you can switch the units to metres and centimetres.
How many square feet are in an acre?
An acre is 43,560 square feet, or about 4,047 square metres.
How much extra flooring should I buy?
Five to ten percent for a straight layout and fifteen percent or more for diagonal or herringbone patterns. Check the installation guide that comes with the product, which may ask for a specific amount.
Does it work out wall area for paint?
Yes, treat each wall as a rectangle (width × height) and tick Take away for doors and windows. Check the paint can for how many square feet a gallon covers.
Is anything sent anywhere?
No. The sums are done in your browser and nothing is stored.