Diameter Calculator – Calculate Circle Diameter
Calculate circle diameter from radius, circumference, or area
Table of Contents
How to Use
- Select input type (radius, circumference, or area)
- Enter the known value
- Click calculate to see the diameter
- Review the calculated diameter
What is Diameter?
The diameter of a circle is the straight line passing through the center of the circle, connecting two points on the circumference. It is twice the length of the radius and is the longest chord of the circle.
Diameter Formulas
- From radius: d = 2r
- From circumference: d = C/π
- From area: d = 2√(A/π)
Frequently Asked Questions
- How do I calculate diameter from radius?
- To calculate diameter from radius, simply multiply the radius by 2. The formula is d = 2r, where d is diameter and r is radius.
- What is the relationship between diameter and circumference?
- The circumference equals π times the diameter (C = πd). Therefore, diameter equals circumference divided by π (d = C/π).