Square Footage Calculator
Find the area of a room, lot or shape. Choose rectangle, circle or triangle, enter the dimensions and get the area instantly.
How it works
- 1
Choose the shape
Rectangle, circle or triangle.
- 2
Enter dimensions
Length and width, radius, or base and height.
- 3
Get the area
In square feet or square meters.
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Frequently asked questions
Split it into two rectangles, calculate each area separately and add them.
Area formulas for common shapes
Rectangle area = length × width. Circle area = π × radius². Triangle area = (base × height) ÷ 2. Measure straight lines and, for irregular rooms, split the space into rectangles and add the areas together.
Square footage is used to estimate flooring, paint, carpet and real estate listings, so accurate measurements matter for both budgeting and pricing.