โšช Circumference Calculator

Calculate the circumference, diameter & area with an interactive visual diagram

Advertisement Space

728 x 90 Banner

๐Ÿ“˜ How to Use: Enter the radius of your circle below, select your preferred unit, and click Calculate. Watch the interactive diagram update to show your circle with labeled measurements!

Enter Circle Radius

๐Ÿ“ Formulas Used:

Circumference: C = 2ฯ€r

Diameter: D = 2r

Area: A = ฯ€rยฒ

Where ฯ€ โ‰ˆ 3.14159...

๐Ÿ’ก Quick Examples:

โ€ข Radius 5cm โ†’ Circumference โ‰ˆ 31.42cm

โ€ข Radius 10cm โ†’ Circumference โ‰ˆ 62.83cm

โ€ข Radius 7cm โ†’ Area โ‰ˆ 153.94cmยฒ

Interactive Circle Diagram

The diagram shows your circle with radius, diameter, and circumference labeled

Advertisement Space

336 x 280 Rectangle

Advertisement Space

728 x 90 Banner

๐Ÿ“š Understanding Circles

What is Circumference?

The circumference is the distance around the outside of a circle. It's like the perimeter of a circle. If you walked around a circular track, you'd travel the circumference distance.

What is Radius?

The radius is the distance from the center of the circle to any point on its edge. It's exactly half of the diameter and is the most fundamental measurement of a circle.

What is Diameter?

The diameter is the distance across the circle through its center. It's the longest distance you can measure in a circle and is always twice the radius.

What is Area?

The area is the amount of space inside the circle. Think of it as how much paint you'd need to fill in the circle, or how much grass would fit inside a circular garden.