Circle Area Calculator
Compute the area of a circle from its radius: A = π × r².
Calculator
Circle Area Calculator
Result
—
Formula
A = π × r²
Step-by-step
- 1
Enter the radius
Distance from center to edge.
- 2
Read the area
Area in square units.
Worked example
Example input: a: 5
Result: 78.5398
Related tools
- Circumference Calculator
2 × π × r.
- Sphere Volume
3D counterpart.