Diameter to Radius Calculator
Convert a positive circle diameter into its radius.
Formula
r=d/2.
Diameter: 10 cm · Radius ≈ (10 cm × 0.01 m/cm)×50
How to use
- Enter the diameter.
- Choose its length unit.
- Read the radius in centimeters.
Examples
- Diameter 10 cm gives radius 5 cm.
Frequently asked questions
Why divide by two?
A diameter spans two radii through the center.
Is circumference the same?
No. Circumference is the distance around the circle.
Which result unit is used?
The result is in centimeters after unit conversion.
Sources
Updated: