Liquidity Index Calculator
Enter water content, liquid limit and plastic limit for the same sample and test 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
LI = (w − PL) / (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
This calculation is meaningful only when values share a sample and test basis. It does not assign a soil classification or provide design or safety conclusions.
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.