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User Guide
This tool will calculate the diameter of a circle from the radius, and will convert different measurement units for radius and diameter.
Formula
The formula used to calculate circle diameter is:
ø = 2 · r
Symbols
- ø = Circle diameter
- r = Circle radius
Radius of Circle
Enter the radius of a circle. The radius is the distance between the centre and any point on the outer edge of a circle.
Diameter of Circle
This is the diameter of a circle that corresponds to the specified radius. 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.