Calculate area for rectangles, triangles, circles, trapezoids, parallelograms, and ellipses from their dimensions.
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Geometry
The area calculator finds the area of rectangles, triangles, circles, trapezoids, parallelograms, and ellipses. Select a shape, enter the required dimensions, and get the result with the formula used.
Rectangle: length times width. Triangle: half base times height. Circle: pi times radius squared. Trapezoid: half the sum of parallel sides times height. Parallelogram: base times height. Ellipse: pi times the product of the two semi-axes.
All formulas assume the inputs are in the same linear unit. The result is in the corresponding square unit.
This calculator covers regular shapes only. Irregular polygons require decomposition into simpler shapes or coordinate-based methods.
Frequently asked questions
Break it into rectangles, triangles, or other regular shapes, calculate each area separately, and sum the results.
The result is in square units matching your input. If you enter metres, the area is in square metres. If you enter feet, the area is in square feet.
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