Enter the diameter of the medulla and the diameter of the hair into the Medullary Index Calculator. The calculator will evaluate the Medullary Index.

## Medullary Index Formula

The following two example problems outline the steps and information needed to calculate the Medullary Index.

MI = M / H

Variables:

- MI is the Medullary Index ( )
- M is the diameter of the medulla
- H is the diameter of the hair

To calculate the medullary index, divide the diameter of the medulla by the diameter of the hair.

## How to Calculate Medullary Index?

The following steps outline how to calculate the Medullary Index.

- First, determine the diameter of the medulla.
- Next, determine the diameter of the hair.
- Next, gather the formula from above = MI = M / H.
- Finally, calculate the Medullary Index.
- 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.

diameter of the medulla = 1

diameter of the hair = 3

MI = M / H** **= ?