Plasticity Index Calculator
Enter liquid limit and plastic limit measured on the same basis.
A QUICK WALKTHROUGH
How to use this tool
- Enter values in consistent units and on the stated sample basis.
- Calculate and review the formula result.
Formula and source
PI = LL − PL. Source: USACE Engineer Form 3836 (2023), https://www.publications.usace.army.mil/Portals/76/Publications/EngineerForms/Eng%20Form%203836_2023Mar_Final.pdf
Scope
The result is a calculated index only; it does not assign a soil classification or give design or safety advice.
Local processing
Values are processed in this browser and are not uploaded or saved.
GOOD TO KNOW
Common questions
Are the inputs uploaded?
No. The calculation runs locally in this browser.
Does this provide classification or design advice?
No. It only calculates the stated formula from entered values.