Which shapes are supported?

Rectangle, square, triangle (base × height), circle, trapezoid, parallelogram and ellipse. Each uses its standard geometric area formula.

What units does the result use?

The calculator is unit-agnostic — whatever unit you enter for the lengths, the area comes out in those units squared (for example metres in gives metres² out).

Is anything uploaded?

No — every calculation runs entirely in your browser and nothing is sent to a server.

Area Calculator

Area of a rectangle, triangle, circle, trapezoid and more.

Area calculator for common shapes

Work out the area of a rectangle, square, triangle, circle, trapezoid, parallelogram or ellipse in one place. Choose a shape, enter the dimensions, and the area is calculated instantly using the standard formula for that shape.

The calculator is unit-agnostic: enter your lengths in any unit and the result comes back in that unit squared. Everything runs in your browser — nothing is uploaded.