Circle Area Calculator
Math CalculatorsCalculate the area of a circle using its radius or diameter.
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Area (A)
About This Tool
Quickly find the area of any circle. Input the radius and let the calculator solve for the surface area using the πr² formula.
Frequently Asked Questions
The formula for the area of a circle is $A = \pi r^2$, where $\pi$ is approximately 3.14159 and $r$ is the radius.
If you have the diameter, divide it by 2 to get the radius, then use the formula $A = \pi r^2$.
Pi ($\pi$) is the mathematical constant representing the ratio of a circle's circumference to its diameter, and it appears in almost all circular geometry formulas.
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