Circle Calculator
Get the area, circumference, and diameter of a circle from its radius.
About the Circle Calculator
Area = πr², circumference = 2πr, diameter = 2r. π ≈ 3.14159 is the ratio of circumference to diameter in every circle.
Get the area, circumference, and diameter of a circle from its radius.
Area = πr², circumference = 2πr, diameter = 2r. π ≈ 3.14159 is the ratio of circumference to diameter in every circle.