- Calculate diameter of circle from area
- Convert an area to different units
- Length and distance converter
- Cylinder volume calculator
This tool will calculate the area of a circle from the diameter, and will convert different measurement units for diameter and area.
The formula used to calculate circle area is:
A = π x (Ø / 2)2
- A = Circle area
- π = Pi = 3.14159…
- Ø = Circle diameter
Diameter of Circle
Enter the diameter or two times the radius of a circle.
Area of Circle
This is the area contained within a circle with the specified diameter.