Rectangle
Area = length × width.
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Area Calculator
Calculate rectangular or circular area in common metric and imperial units.
Area
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Enter your details to calculate.
Area Calculator guide
Circle
Area = π × radius². Enter the diameter and the calculator halves it to get the radius.
Unit conversion
Dimensions are converted to metres internally before the area is calculated.
Frequently asked questions
How do I find the area of a rectangle?
Multiply its length by its width.
How do I find the area of a circle?
Multiply π by the radius squared.
Why are square units different from normal units?
Area measures two dimensions, so the unit is squared, such as m² or ft².