Area Calculator
Calculate the area of a square, rectangle, triangle, circle, trapezoid or parallelogram.
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Area Formulas
The tool covers the six most used shapes: square a², rectangle a×b, triangle ½×base×height, circle π×r², trapezoid (a+b)÷2×h and parallelogram base×height. Pick a shape, type the dimensions, and the area appears instantly in the same unit squared (cm² if you enter cm, m² if you enter m).
Frequently Asked Questions
What unit is the result in?
The square of whatever unit you enter: metres give m², centimetres give cm². To convert m² to cm² multiply by 10,000.
Which height do I use for a triangle?
The perpendicular distance from the chosen base to the opposite vertex — not the slanted side length. Any of the three sides can serve as the base.
How do I find the area of an irregular shape?
Split it into rectangles and triangles, compute each area with this tool and add the results.
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Area Calculator