Square Footage Calculator

Calculate area in square feet for any shape — rooms, yards, properties.

Select Shape

Square Feet
Square Yards
Square Meters
Total Cost

Area Formulas

ShapeFormulaExample
Rectanglelength × width12×12 = 144 sq ft
Squareside²10² = 100 sq ft
Circleπ × radius²r=5 → 78.5 sq ft
Triangle0.5 × base × height10×8 → 40 sq ft
Trapezoid(top+bottom)/2 × height(6+10)/2×8 = 64 sq ft

Conversions

Tip: For irregular rooms, divide into rectangles and calculate each separately. Measure wall-to-wall, not baseboard-to-baseboard.

FAQ

How to calculate square footage?
Rectangle: length × width. Circle: π × radius². Triangle: 0.5 × base × height. Always measure in feet.
12×12 room is how many sq ft?
144 square feet.
How to measure irregular rooms?
Divide into rectangles/triangles, calculate each area, then add together.
Sq ft to sq yards?
Divide by 9. 1 square yard = 9 square feet.

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