Square Footage Calculator – Free Online

About this calculator

Choose a shape and enter its dimensions. The area is shown in both square feet and square metres, which is useful for flooring, turf and paint jobs.

Rectangle: l × w | Circle: π × r² | Triangle: ½ × base × height

Worked exampleA 5 m × 4 m room = 20 m² = 215.3 ft².

How do I measure an L-shaped room?

Split it into rectangles, calculate each and add them.

How many ft² in a m²?

One square metre is 10.7639 square feet.

Should I add extra for flooring?

Yes, add about 10% for cuts and waste.