Calculate the area of any 2D shape — circle, rectangle, triangle, trapezoid, parallelogram, ellipse, sector, and more — with formulas and step-by-step working.
Select Shape
Area
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Area
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Perimeter
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Formula
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Shape
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Select a shape and enter dimensions
11 shapes supported with formulas and perimeters.
Frequently Asked Questions
What units does this calculator use?
You can use any consistent unit — inches, cm, metres, etc. The area result will be in square units of whatever you input (e.g. if you enter metres, area is in m²).
What is Heron's formula?
Heron's formula calculates the area of a triangle from its three side lengths: s = (a+b+c)/2, then Area = √(s(s−a)(s−b)(s−c)). It works for any triangle including scalene.