Square Footage Calculator

Calculate the area of a room, floor, wall or plot in square feet, with conversions to square meters, square yards and acres.

How to use the Square Footage Calculator

  1. Choose the shape and whether you are measuring in feet or meters.
  2. Enter the dimensions and, if you have several identical areas, the quantity.
  3. Read the area and optionally add a price per square foot for a cost estimate.

Square footage formulas

  • Rectangle: length × width
  • Circle: π × (diameter ÷ 2)²
  • Triangle: base × height ÷ 2

A room 12 ft long and 10 ft wide is 12 × 10 = 120 square feet.

Measuring irregular rooms

Split an L-shaped or irregular room into rectangles, calculate each one and add the results. If your measurements include inches, convert them to decimal feet first by dividing the inches by 12: 10 ft 6 in is 10.5 ft.

Useful conversions

  • 1 square meter = 10.764 square feet
  • 1 square yard = 9 square feet
  • 1 acre = 43,560 square feet

Frequently asked questions

How do I calculate square feet?

Multiply the length by the width, both in feet. For example, 15 ft × 12 ft = 180 sq ft.

How do I convert square meters to square feet?

Multiply square meters by 10.764. For example, 20 m² is about 215.3 sq ft.

How do I measure an L-shaped room?

Divide it into two rectangles, find the area of each and add them together.

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