# Diameter of a Circle from Radius Calculator

A circle is a plane geometric shape where the distance from the center to the corner of the circle remains the same. The radius is the distance from the center outwards. A circle has about 80% of the area of a similar width square. Below given an online geometry calculator to calculate the diameter of a circle based on the radius. Just input the radius value in the input field and the diameter of a circle from radius calculator will update you with the resultant value.

A circle is a plane geometric shape where the distance from the center to the corner of the circle remains the same. The radius is the distance from the center outwards. A circle has about 80% of the area of a similar width square. Below given an online geometry calculator to calculate the diameter of a circle based on the radius. Just input the radius value in the input field and the diameter of a circle from radius calculator will update you with the resultant value.

Code to add this calci to your website

#### Formula:

D = 2 × R
**Where,**
D = Diameter
R = Radius
### Example:

Calculate diameter of a circle from radius of about 15 cm.

#### Solution:

D = 2 x 15

= 30 cm.