Area of a Circle Calculator: Radius to Area
Calculate the area, diameter, and circumference of a circle.
Circle Formulas
Area: A = πr²
Circumference: C = 2πr
Diameter: d = 2r
Calculator Hub Pro Calculate the area, diameter, and circumference of a circle.
Area: A = πr²
Circumference: C = 2πr
Diameter: d = 2r