Square Footage Calculator
Enter the measurements of a room, a lawn or any flat area to get its size in square feet. Choose a rectangle, circle or triangle, and add up several identical areas if you need to.
Type a number and the answer appears straight away.
Area180 sq ft
- Square yards
- 20
- Square meters
- 16.72
- Square inches
- 25,920
- Acres
- 0.0041
For an L-shaped room, split it into two rectangles, work out each one and add them together.
The math behind it: Square Footage
rectangle: length x width; circle: 3.1416 x (diameter / 2) squared; triangle: base x height / 2
A room 12 feet by 15 feet is 180 square feet, which is 20 square yards or 16.72 square meters. For an L-shaped room, split it into two rectangles, work out each one and add them together.
Common questions
How do I calculate square footage?
Multiply the length by the width, both in feet. A room 12 ft by 15 ft is 180 square feet.
How do I work out square feet when I measured in inches?
Convert each measurement to feet first by dividing by 12, then multiply. Or multiply the inches together and divide by 144.
How many square feet is a 10 foot circle?
A circle 10 feet across is 78.54 square feet.
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