What units does this calculator use?

The result is in square units of whatever you enter. If you enter metres, the result is in m². If you enter feet, the result is in ft².

How do I calculate the area of an irregular shape?

Break the shape into simpler shapes (rectangles, triangles), calculate each area, then add them together.

Pi is a mathematical constant approximately equal to 3.14159. It represents the ratio of a circle's circumference to its diameter.

Area measures the surface inside a shape (in square units), while perimeter measures the total length around the outside of the shape.

Calculate the area of common shapes: rectangle, square, triangle, and circle. Select a shape and enter the dimensions to get instant results.

Length

Width

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Understanding Area Measurements and Area Calculations

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Step 1: Select the shape tab (Rectangle, Square, Triangle, or Circle).

Step 2: Enter the required dimensions.

The area is calculated instantly in square units matching your input.

Rectangle: Area = length × width

Square: Area = side²

Triangle: Area = ½ × base × height

Circle: Area = π × radius²

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