Circle Area Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the radius.
- Press Calculate for the area.
How it works
The area of a circle is π × radius². The radius is the distance from the centre to the edge.
Worked example
Radius 1 m. Area = π × 1² = 3.1416 m².
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.