Calculate plasticity index, liquid limit and plastic limit, plus liquidity index, consistency index and USCS soil group from LL, PL and water content.
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Plasticity Index Formula
The following two example problems outline the steps and information needed to calculate the Plasticity Index.
PI = LL - PL
Variables:
- PI is the Plasticity Index (%)
- PL is the plastic limit (%)
- LL is the liquid limit (%)
To calculate the plasticity index, subtract the plastic limit from the liquid limit.
How to Calculate Plasticity Index?
The following steps outline how to calculate the Plasticity Index.
- First, determine the plastic limit.
- Next, determine the liquid limit.
- Next, gather the formula from above = PI = LL - PL.
- Finally, calculate the Plasticity 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.
plastic limit = 4
liquid limit = 6
PI = LL - PL = ?
