Calculated Area
0
Master Geometry: The Circle Area Calculator
Finding the surface area of a circle is a fundamental requirement in geometry, engineering, and home improvement. Whether you are calculating the amount of fabric needed for a circular tablecloth or solving a school math problem, our Free Circle Area Calculator provides the answer in seconds
How to Calculate Circle Area
The area of a circle is determined by its radius—the distance from the center to the edge. The standard formula is:
A=πr2
If you only know the diameter (the distance across the entire circle), you simply divide it by two to find the radius before squaring it. Our tool handles this conversion automatically—just select "Diameter" from the dropdown menu.
Why Use This Tool?
- Dual Input Modes: Calculate using the radius (r) or the diameter (d).
- Precision Built-In: We use the high-precision value of π (Pi) to ensure your results are mathematically sound.
- Smart Display: No cluttered zeros. If your area is a clean 10, it shows as 10, not 10.000.
- 100% Free: Use it for homework, crafts, or work with zero limits.