Enter the radius of the cation and the radius of the anion into the Radius Ratio Calculator. The calculator will evaluate the Radius Ratio.

## Radius Ratio Formula

The following two example problems outline the steps and information needed to calculate the Radius Ratio.

RR = Rc / Ra

Variables:

- RR is the Radius Ratio ( )
- Rc is the radius of the cation
- Ra is the radius of the anion

To calculate the radius ratio, divide the radius of the cation by the radius of the anion.

## How to Calculate Radius Ratio?

The following steps outline how to calculate the Radius Ratio.

- First, determine the radius of the cation.
- Next, determine the radius of the anion.
- Next, gather the formula from above = RR = Rc / Ra.
- Finally, calculate the Radius Ratio.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

radius of the cation = 1.25

radius of the anion = 1.5

RR = Rc / Ra** **= ?