Enter the probing depth (mm) and the gingival margin level (mm) into the Clinical Attachment Loss Calculator. The calculator will evaluate the Clinical Attachment Loss.

## Clinical Attachment Loss Formula

The following two example problems outline the steps and information needed to calculate the Clinical Attachment Loss.

**CAL = PD – GM**

Variables:

- CAL is the Clinical Attachment Loss (mm)
- PD is the probing depth (mm)
- GM is the gingival margin level (mm)

## How to Calculate Clinical Attachment Loss?

The following steps outline how to calculate the Clinical Attachment Loss.

- First, determine the probing depth (mm).
- Next, determine the gingival margin level (mm).
- Next, gather the formula from above = CAL = PD – GM.
- Finally, calculate the Clinical Attachment Loss.
- 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.

probing depth (mm) = 9

gingival margin level (mm) = 3

CAL = PD – GM** **= ?