Shannon Diversity Index Calculator
Calculate the Shannon diversity index to measure biodiversity and species diversity. Analyze ecosystem health, species richness, and evenness with this comprehensive tool.
Shannon Diversity Index Formula
H = -Σ(pi × ln(pi)) where pi is the proportion of individuals of species i
The index considers both species richness (number of species) and evenness (how equally abundant they are). Higher values indicate greater diversity.
Example Ecosystems
Species Data
Calculation Settings
Natural logarithm is the standard choice for Shannon index
Diversity Analysis Results
Shannon Index (H)
0.000
Evenness (E)
0.000
Species Richness
0
Total Individuals
0
Max Possible Diversity
0.000
Diversity %
0.000%
Species Composition
Add species data to see composition analysis
Ecological Recommendations
Add species data to calculate diversity
Shannon Index Interpretation Guide
| Shannon Index Value | Diversity Level | Ecosystem Health | Typical Examples |
|---|---|---|---|
| H = 0 | No Diversity | Monoculture | Agricultural fields, degraded habitats |
| 0 < H < 1 | Low Diversity | Poor | Polluted areas, urban environments |
| 1 ≤ H < 2 | Moderate Diversity | Fair | Temperate forests, grasslands |
| 2 ≤ H < 3 | High Diversity | Good | Mature forests, coral reefs |
| H ≥ 3 | Very High Diversity | Excellent | Tropical rainforests, pristine ecosystems |
Key Diversity Concepts
Species Richness
The total number of different species in a community. More species generally means higher diversity.
Species Evenness
How equally abundant species are. High evenness means no single species dominates the community.
Shannon Index
Combines richness and evenness into a single measure. Higher values indicate greater biodiversity and ecosystem health.