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Results history (All cells are editable)
| Shape | Radius | Area | Note |
| {y} |
Calculate the Area of a Circle or Disk Online Using the Radius
This tool lets you calculate the area of a circle to find its surface.
Radius: the key element for calculating the circle's surface
The radius is a segment connecting the center of the circle to a point on the circle. To calculate the area of a disk, you first need to know the measurement of its radius, then enter it into the calculator, which automatically calculates the surface.
Which formula is used?
The formula for calculating the area is: π × radius².
The number π is a constant value often used in circle-related calculations.
π = pi ≈ 3.14159265358979323846
Saved results
You can save your calculations to find them later. Just click the Save button. A table with your results is generated. You can then export these results in PDF or CSV format.
Keyboard shortcuts
m ⇝ Clear
f ⇝ Save