Circle Diameter, Area & Circumference Calculator
The Circle Diameter, Area, & Circumference Calculator is a userfriendly tool designed to quickly and accurately calculate the area of a circle, the diameter of a circle, or the circumference of a circle. The calculator is useful for students and professionals who need to perform these calculations for various applications, such as geometry, engineering, or physics. The user can enter the diameter, circumference, or area of the circle, and the calculator will solve for the remaining two parameters. The calculator is easy to use and requires no advanced mathematical skills or knowledge.
Instructions:

Select US or Metric Units

Select Input type:

Diameter

Circumference

Area


Enter Input value

Select the units for the input value.

Click the Calculate button

The results are displayed in the Results table
Methodology:
Equations for the circumference and area of a circle
Area = pi x D^2 /4
Circumference = pi x D
where: D= diameter