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Area Calculator – Rectangle, Circle, Triangle & More

Area is the measure of the 2D space enclosed by a shape — essential for home improvement projects like flooring, painting, and tiling; landscaping; architecture; and geometry. Different shapes require different formulas, and confusing them leads to costly over- or under-ordering of materials.

Select a shape, enter the required measurements, and get the area instantly along with the formula used. The tool supports all common geometric shapes and works with any unit of length, returning results in the corresponding square units.

How to use the Area Calculator

Select the shape from the list.

Enter the required dimensions (varies by shape: length/width, radius, base/height, etc.).

View the area and the formula applied.

Area Formulas for Common Shapes
Shape	Formula	Key Inputs
Rectangle	l × w	Length, Width
Circle	π × r²	Radius
Triangle	½ × b × h	Base, Height
Trapezoid	½(a+b) × h	Parallel sides a & b, Height
Parallelogram	b × h	Base, Height
Ellipse	π × a × b	Semi-major axis a, Semi-minor axis b
Regular Hexagon	(3√3/2) × s²	Side length s

Area Calculator FAQ

How do I find the area of an L-shaped room?

Divide the L-shape into two rectangles. Calculate each area separately (length × width), then add them together. This technique works for any irregular polygon — decompose into simpler shapes and sum.

What is the difference between area and perimeter?

Area measures the surface inside a shape (square units). Perimeter measures the total boundary length of a shape (linear units). Painting uses area; fencing uses perimeter.

How do I convert square feet to square metres?

1 square foot = 0.0929 square metres. Multiply sq ft by 0.0929 for sq metres. Multiply sq metres by 10.764 for sq feet.

How many square feet are in an acre?

43,560 square feet = 1 acre. A square acre would measure approximately 208.7 feet on each side.