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User Guide
This tool will calculate the area of a circle from the diameter, and will convert different measurement units for diameter and area.
Formula
The formula used to calculate circle area is:
A = π · (ø/2)2
A = ¼ · π · (ø/2)2
Symbols
- A = Circle area
- π = Pi = 3.14159…
- ø = Circle diameter
Diameter of Circle
Enter the diameter of a circle. The diameter of a circle is the length of a straight line drawn between two points on a circle where the line also passes through the centre of a circle, or any two points on the circle as long as they are exactly 180 degrees apart.
Area of Circle
This is the area contained within a circle with the specified diameter.