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The area of a circle calculator helps you compute the surface of a circle given a diameter or radius. Our tool works both ways — no matter if you're looking for an area-to-radius calculator or a radius to the. See How to Calculate the Area below, but first the calculator: Enter the radius, diameter, circumference or area of a Circle to find the other three. Dec 9, 2025 · Area of a Circle: A Complete Guide The Knowledge Academy 09 December 2025 The Area of a Circle is the space enclosed within its boundary, calculated using the formula A = πr²,. Understand that you can easily determine the area of a circle using the formula Area = π × r^2, where π is approximately 3.14, and r represents the radius of the circle. Note that radius is half the diameter of.