Volume Calculator
Volume of any solid.
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Geometry
Area Calculator
Find the area of a rectangle, triangle, circle, trapezoid and more.
Area
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Square units.
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Enter your figures above to see the step-by-step working.
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How the Area Calculator Works
Area measures the space inside a two-dimensional shape, in square units. Pick a shape and this calculator shows just the measurements it needs — a rectangle takes length and width, a triangle takes base and height, a circle takes the radius — then applies the right formula.
All the classic formulas are here: rectangle (a×b), square (a²), triangle (½·base·height), circle (πr²), trapezoid (½(a+b)·h) and parallelogram (base×height). Keep your measurements in the same unit and the answer is in that unit squared.
area depends on shape — e.g. rectangle = length × width, circle = πr²
Frequently Asked Questions
How do you calculate area?
It depends on the shape. A rectangle is length times width; a triangle is half the base times the height; a circle is π times the radius squared. Pick a shape and enter its measurements.
What units is area in?
Square units of whatever you entered — square inches, square feet, square metres and so on. Keep all measurements in the same unit.
How do I find the area of an odd shape?
Split it into rectangles, triangles and circles, find each area, and add them up.
More From The Desk
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Surface area of a solid.
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Circle area & circumference.
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Open →Triangle Area Calculator
Triangle area.
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