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Maths · Free online calculator

Area Calculator

Choose a shape to calculate area with dedicated inputs, diagrams and formulas.

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Choose a shape

Each shape has its own calculator with labelled dimensions, validation and measurement units.

Rectangle

Formula: l × w

Triangle

Formula: Heron’s formula

Circle

Formula: πr²

Trapezoid

Formula: (a + b)h / 2

Parallelogram

Formula: bh

Ellipse

Formula: πab

Circle sector

Formula: πr²θ / 360

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