Circle area
Find the area enclosed by a circle.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
A = πr²
Variables & units
- Radius
- m · minimum 0
Worked example
A radius of 5 m gives approximately 78.539816 m².
Assumptions
Radius is half the diameter.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
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