# Consistancy Index

Consistancy index, abbreviated as \(l_c\), also called Atterberg limit, is the range of water content to the firmness of the soil.

## Consistancy Index formula

\(\large{ CL = \frac{ LL \;-\; w }{ PI } \; 100 \% }\) |

### Where:

\(\large{ CL }\) = consistancy index

\(\large{ w }\) = natural water content

\(\large{ PI }\) = plasticity index

\(\large{ LL }\) = liquid limit

Tags: Equations for Water Equations for Soil Equations for Geotechnical