Enter the plastic limit and the plasticity index into the Liquid Limit Calculator. The calculator will evaluate the Liquid Limit.

## Liquid Limit Formula

The following two example problems outline the steps and information needed to calculate the Liquid Limit.

LL = PL - PI

Variables:

- LL is the Liquid Limit ( )
- PL is the plastic limit
- PI is the plasticity index

To calculate the liquid limit, subtract the plasticity index from the plastic limit.

## How to Calculate Liquid Limit?

The following steps outline how to calculate the Liquid Limit.

- First, determine the plastic limit.
- Next, determine the plasticity index.
- Next, gather the formula from above = LL = PL – PI .
- Finally, calculate the Liquid Limit.
- 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.

plastic limit = 43

plasticity index = 25

LL = PL – PI ** **= ?