Species Diversity Index Calculator
Calculate Shannon-Wiener (H'), Simpson's Diversity Index, and evenness from species abundance data for up to 10 species.
Inputs
Results
Shannon Index (H')
1.79
Simpson's Diversity (1-D)
0.8
How to Use This Calculator
- Enter the individual count for each species (up to 10) from your quadrat or transect survey.
- Review Shannon Index (H') — higher values indicate greater diversity.
- Check Simpson's Diversity (1-D) for a probability-based complement to dominance.
- Note Pielou's Evenness (J) — values near 1 mean all species are equally abundant.
- Use these indices to compare diversity between sites, seasons, or treatment conditions.
How the result changes with Species 1 Count
| Species 1 Count | Shannon Index (H') | Simpson's Diversity (1-D) |
|---|---|---|
| 10,000 | 0.07 | 0.02 |
| 35,000 | 0.02 | 0.01 |
| 65,000 | 0.01 | 0 |
| 90,000 | 0.01 | 0 |
What each input means
- Species 1 Count
- Number of individuals observed for species 1.
- Species 2 Count
- Number of individuals observed for species 2.
- Species 3 Count
- Number of individuals observed for species 3.
- Species 4 Count
- Number of individuals observed for species 4.
- Species 5 Count
- Number of individuals observed for species 5.
- Species 6 Count
- Number of individuals observed for species 6. Set to 0 if unused.
- Species 7 Count
- Number of individuals observed for species 7. Set to 0 if unused.
- Species 8 Count
- Number of individuals observed for species 8. Set to 0 if unused.
- Species 9 Count
- Number of individuals observed for species 9. Set to 0 if unused.
- Species 10 Count
- Number of individuals observed for species 10. Set to 0 if unused.
What each result means
- Shannon Index (H')
- Higher values indicate greater diversity. Typical range: 0-4.
- Simpson's Diversity (1-D)
- Ranges 0-1. Higher = more diverse.
- Pielou's Evenness (J)
- 0 = uneven, 1 = perfectly even distribution among species.
- Berger-Parker Dominance
- Proportion of the most abundant species. Lower = more even.
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