Calculate the area of a space in square feet, square yards and square meters, for rectangular, circular or triangular shapes.
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For a rectangle, area is length × width. For a triangle, area is ½ × base × height. For a circle, area is π × radius², using half of the diameter you enter as the radius. All three formulas use the values you enter for 'Length, Base, or Diameter' and 'Width or Height' depending on the shape selected, the second field is ignored for circles.
Square feet is the standard unit for most home improvement projects in the US. Square yards is commonly used when buying carpet (9 square feet = 1 square yard). Square meters is the standard metric unit, useful when working with international suppliers or specifications.
For a rectangle 12 ft × 10 ft: area = 12 × 10 = 120 sq ft, which is 120 ÷ 9 ≈ 13.33 sq yards, or 120 × 0.092903 ≈ 11.15 sq meters.
Entering a circle's radius instead of its diameter, this calculator's first field expects the diameter for circles, entering the radius by mistake would produce an area only a quarter of the correct size.
Forgetting to halve the base × height for a triangle, unlike a rectangle (length × width), a triangle's area is ½ × base × height, using the rectangle formula for a triangular space would double the true area.
Not splitting an L-shaped or irregular room into simpler pieces first, this calculator handles single rectangles, circles or triangles only, complex shapes need to be broken into simpler pieces and added together.
Split the space into simpler rectangles or triangles, calculate each one separately using this tool, and add the results together for the total area.
Multiply the radius by 2 to get the diameter, then enter that value in the 'Length, Base, or Diameter' field.
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