The Shannon Diversity Index Calculator is an essential tool for ecologists, biologists, and environmental scientists to measure and understand species diversity within a community. Input your species abundance data and instantly get the Shannon Index (H), species richness (S), and evenness (E), providing key insights into ecosystem health and structure.
Formula:
The Shannon Diversity Index (H) is calculated using the formula:
H = - Σ (pi * ln(pi))
Where:
- pi = the proportion of individuals belonging to the i-th species (ni / N)
- ni = the number of individuals of species i
- N = the total number of individuals across all species
- ln = the natural logarithm
Species Evenness (E) is calculated as: E = H / ln(S), where S is the total number of species (species richness).