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Area Calculator

Area of rectangles, circles, triangles and more

Frequently Asked Questions

How do I calculate area?
Pick a shape and enter its measurements. Rectangle = length × width, triangle = ½ × base × height, circle = π × radius², and so on. Results are in the square of whatever unit you use.


Calculate the area of common shapes — rectangle, square, triangle, circle, trapezoid, parallelogram and ellipse.