Square Feet Calculator US
Work out the area of a rectangle, circle or triangle in square feet, square meters and square yards.
How it works
Choose a shape, switch between metric and imperial units, and enter the dimensions. The calculator returns the area in square feet, square meters and square yards.
Frequently asked questions
How do I calculate square feet?
Multiply length by width in feet. A 12 ft by 10 ft room is 120 square feet.
How do I find the area of an irregular room?
Divide it into rectangles, calculate each oneโs area, and add them together. For curved areas, use the circle or triangle formulas.
How do I convert square inches to square feet?
Divide by 144, because one square foot contains 12 ร 12 = 144 square inches.
How do I convert square metres to square feet?
Multiply by about 10.764. So 20 square metres is roughly 215 square feet.
Why do I need square footage for flooring?
Materials are sold by area, so knowing the square footage โ plus a wastage margin โ tells you how much to buy.
Is square footage the same as floor area?
Generally yes for a room, though property listings may define it differently (for example including or excluding certain spaces).
Calculating square footage
Square footage is the area of a space measured in square feet. For a rectangular room it is simply length ร width, both in feet. This calculator finds the area for rectangles and other shapes and converts between units.
Worked example
A room 12 feet by 10 feet is 12 ร 10 = 120 square feet. For an L-shaped space, split it into rectangles, find each area, and add them together. For a circle, the area is ฯ ร radiusยฒ.
Converting units
If you measured in inches, divide by 144 to get square feet (since 12 ร 12 = 144 square inches per square foot). To convert from square metres, multiply by about 10.764 โ so 20 mยฒ is roughly 215 square feet.
Square footage is essential for flooring, paint, carpet and real-estate listings. For materials, measure the area to cover, then add a small wastage margin; for buying or renting, it is the standard way to compare the size of properties.
Results are estimates for general guidance in United States and may not reflect the latest local rates, fees or rules. Check official sources before making decisions.