Circle Area Calculator
Calculate circle area, circumference, radius, and diameter instantly with our free circle calculator. Perfect for geometry homework, engineering projects, and design work. Get accurate results with step-by-step solutions and support for any measurement input.
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area
circumference
Common Circle Examples
Click examples to try circle area calculations instantly
1Circle Measurements
Enter any one measurement to calculate area, circumference, and all other measurements
How it works: Enter any one measurement (radius, diameter, or circumference) and the calculator will find all other measurements using the relationships: r = d/2 = C/(2π), Area = πr², C = 2πr.
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