Island Biogeography Calculator
Predict species richness from island area and distance using the species-area relationship (S = cA^z) from MacArthur & Wilson's theory.
Inputs
km²
km
Results
Predicted Species Richness
26.6
Species at Half Area22.4
Species at Double Area31.6
% Lost if Area Halved15.9%
Immigration Rate3.68 spp/time
Extinction Rate4.73 spp/time
Isolation LevelModerate
Species Gained Double5.03
Equilibrium Species15.12
How to Use This Calculator
- Enter Island Area (km2) and Distance from Mainland (km).
- Set the z Exponent (typically 0.20-0.35) and c Constant from the species-area relationship.
- Review Predicted Species Richness, and the species count at half and double the current area.
- Check % Lost if Area Halved to evaluate the conservation impact of habitat fragmentation.
- Use Immigration and Extinction Rates to understand equilibrium dynamics on the island.
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