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Square footage calculator

Choose a shape and enter its measurements. If the space isn't a simple rectangle, split it into parts and the calculator adds them up.

It also shows the result in square metres.

How it's calculated

Rectangle: length × width.
Triangle: base × height ÷ 2.
Circle: π × radius × radius, where the radius is half the diameter. 1 m² is 10.76 ft².

An example

An L-shaped living room can be split into a 16 × 12 ft rectangle and a 10 × 6 ft one. That is 252 ft² in total.

A round table 2 ft across covers 3.14 ft².

Frequently asked questions

How do I work out the square footage of a room?

Measure the length and width in feet and multiply them. A 12 × 10 ft room is 120 ft².

What if my measurements are in inches or centimetres?

Convert them first: divide inches by 12 to get feet, or centimetres by 100 to get metres. 350 cm is 3.5 m.

How do I convert square metres to square feet?

Multiply by 10.76. 20 m² is 215.28 ft².

Key terms

Square metre (m²): The area of a square 1 metre on each side.
Square foot (ft²): The area of a square 1 foot on each side.

The same calculation in other countries

Up-to-date official data

We check the official sources automatically, every day.

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