Circle Calculator

Circle Calculator




Circle is the set of all points in a plane at a fixed distance, called the radius, from a given point called the center. Other properties of a circle are:

  • Circumference: is the length of the edge of the circle.
  • Diameter: is the longest straight line that can be drawn from one point on the circumference to another point on it. It passes through the center of the circle.


Area: Area of a Circle is calculated by the formula: π * (Radius)2

Circumference: This is calculated by the formula: 2 * π * Radius

Diameter: Diameter is twice the radius of the circle and hence: 2* Radius

Pi: This is the ratio of Circumference of the circle to the Diameter of the circle. This is usually represented by the symbol “π” and has a value of 3.14159…

Units: Measurement units of Area, Radius, and Circumference

Meter (m): is the base unit of length in the International System of Units (SI). Meter is defined as the distance traveled by light in a specific fraction (1299 792 458) of a second.

Other SI units: are millimeter (mm) ie 1/1000 of m, centimeter (cm) which is 1/100 of m and kilometer (km) which is equal to 1000m.

Other English units of measure of distance are:
Mile: An English unit of length, it is equal to 1609 meters (m).
Yard: It is equal to 0.9144 meters (m).
Foot: It is equal to 0.3048 meters (m).