Estimate diversity, dominance, and evenness with confidence. Review species balance clearly. Turn field observations into meaningful ecological evidence today.
Enter one species name and one abundance value per line. The form keeps a single-column page flow, while fields use a responsive grid.
This example shows how to organize field observations before entering them into the calculator.
| Habitat | Species | Observed Count |
|---|---|---|
| Wetland A | Heron | 12 |
| Wetland A | Duck | 18 |
| Wetland A | Frog | 25 |
| Wetland A | Dragonfly | 16 |
| Wetland A | Snail | 9 |
Species Richness: S = number of species with positive abundance.
Total Individuals: N = Σni, where ni is abundance of each species.
Species Proportion: pi = ni / N.
Shannon Index: H' = -Σ(pi × ln(pi)). Higher values usually indicate greater diversity and stronger balance among species.
Simpson Index: D = Σ(pi²). Lower dominance concentration usually means a more diverse community.
Simpson Diversity: 1 - D.
Reciprocal Simpson: 1 / D.
Pielou Evenness: J = H' / ln(S).
Margalef Richness: (S - 1) / ln(N).
Menhinick Richness: S / √N.
Berger-Parker Dominance: d = Nmax / N, where Nmax is the abundance of the most common species.
1. Enter a habitat or sampling label to identify your observation set.
2. Add sample area and sampling units if you want density and richness-per-unit context.
3. Type one species name per line in the species box.
4. Enter one abundance value per line in the counts box, matching the same order.
5. Submit the form to calculate richness, diversity, evenness, and dominance metrics.
6. Review the result panel above the form, then inspect the proportion table and chart.
7. Export the visible results as CSV or PDF for reports, audits, or field records.
It measures diversity using richness, evenness, and dominance metrics. These values help compare ecological communities and show whether abundance is balanced across species or concentrated in only a few.
They highlight different diversity patterns. Shannon responds strongly to rare species and overall uncertainty, while Simpson emphasizes dominance and the influence of common species.
Dominance metrics rise, while evenness and diversity often fall. That pattern suggests the habitat is less balanced, even if total abundance remains high.
No. This calculator ignores zero-abundance entries in final biodiversity computations because they do not contribute to observed richness within the submitted sample.
Not always. A higher value means greater observed diversity, but interpretation depends on habitat type, season, sampling design, and conservation goals.
Yes. Run the first habitat, save or export results, then enter the second habitat. Comparing identical metrics makes habitat-level interpretation easier.
You can use square meters, hectares, or another consistent unit. Density results remain meaningful when the same area unit is used across comparisons.
No. It is useful for practical diversity estimation and quick comparisons, but formal ecological studies may require additional sampling tests and inferential methods.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.