Area Calculator
Calculate the area of common shapes.
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Frequently asked questions
It covers rectangles, squares, triangles, circles, trapezoids, parallelograms, and ellipses. Pick a shape, enter its dimensions, and the area updates instantly.
The calculator is unit-agnostic. Enter every length in the same unit — centimeters, inches, meters, whatever you like — and the area comes out in that unit squared (for example, square meters).
Rectangle = width × height, square = side², triangle = ½ × base × height, circle = π × radius², trapezoid = ½ × (a + b) × height, parallelogram = base × height, and ellipse = π × semi-major × semi-minor.
No. The calculation runs entirely in your browser using JavaScript. The dimensions you type never leave your device.
Last updated 2026-06-23.