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Square Footage Calculator

Work out the area of rooms, circles and triangles in square feet or square metres. Add several rooms, allow for waste and estimate the cost.

Calculated on your device
LengthWidth
1
×
2
×
3
×
4
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5
×
6
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Add up to 6 rooms or areas. For an L-shaped room, split it into two rectangles.

Enter a number, for example 1250 or 19.99.
Enter a number, for example 1250 or 19.99.
Measured at right angles to the base.
Enter a number, for example 1250 or 19.99.
Waste and cost (optional)
%
Flooring and tiles usually need 5% to 15% extra for cuts.
Enter a number, for example 1250 or 19.99.
$
Per square foot for feet, inches or yards; per square metre for metres or cm.
Enter a number, for example 1250 or 19.99.
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Works in WordPress (Custom HTML block), Wix (Embed code), Squarespace (Code block), Webflow and Shopify pages.

How to use the square footage calculator

  • Rooms: enter the length and width of up to 6 rectangles. The calculator adds them up, so you can measure a whole flat or house room by room. Split L-shaped rooms into two rectangles.
  • Circle and triangle: for round patios, bay areas and gables.
  • Choose feet, inches, yards, metres or centimetres. Add extra for waste and a price per square foot or square metre to estimate cost.

Area formulas

Rectangle = Length × Width
Circle = π × (Diameter ÷ 2)²
Triangle = Base × Height ÷ 2
1 m² = 10.7639 ft²  ·  1 yd² = 9 ft²  ·  1 acre = 43,560 ft²

Measure feet and inches as decimal feet: 6 inches is 0.5 ft, 3 inches is 0.25 ft, and 9 inches is 0.75 ft.

Worked example

Two rooms: 12 × 10 ft = 120 ft² and 14.5 × 12 ft = 174 ft². Total = 294 ft². With 10% extra for waste, buy 323.4 ft² of flooring, which is 30.04 m².

Tips for measuring

  • Measure wall to wall at floor level, and round up to the nearest inch or centimetre.
  • Leave out fixed cabinets or islands if the flooring won't go under them.
  • Flooring comes in boxes, so round up to whole boxes after adding waste.

Pouring a slab? The concrete calculator works out the volume. For other conversions, use the unit converter.

Frequently asked questions

How do I convert square feet to square metres?

Multiply by 0.09290304, or divide by 10.7639. 294 ft² is 27.31 m².

Is square footage the same as carpet area?

Not always. In India, carpet area is the usable floor inside the walls, while built-up and super built-up area add walls and shared spaces. Measure inside the walls for carpet area.

Formulas checked 29 October 2026. How we test our calculators. Measurements are estimates. Add a margin for waste and check with your supplier before you buy.