How it works
The area of a circle is π times the radius squared; the circumference is 2π times the radius.
Area = π × r² · Circumference = 2 × π × r
Circle Calculator
Find the area, circumference, and diameter of a circle.
Find the area, circumference, and diameter of a circle.
The area of a circle is π times the radius squared; the circumference is 2π times the radius.
Area = π × r² · Circumference = 2 × π × r