# Species Evenness Index Calculator

Species Evenness is the measurement of the relative abundance of different species, in a way to show the richness of the area. It is mathematically termed as diversity index, means a measure of biodiversity. A different number of metrics are used in calculating the evenness. Use species evenness index calculator to perform Shannon-Wiener index calculation based on the values of Shannon's diversity index, total number of species recorded and the total number of individuals in the sample.

## Shannon-Wiener Index Calculation

Species Evenness is the measurement of the relative abundance of different species, in a way to show the richness of the area. It is mathematically termed as diversity index, means a measure of biodiversity. A different number of metrics are used in calculating the evenness. Use species evenness index calculator to perform Shannon-Wiener index calculation based on the values of Shannon's diversity index, total number of species recorded and the total number of individuals in the sample.

Code to add this calci to your website  #### Formula:

Species Evenness = i / Ln((s-1) / Ln(n)) Where, s = Number of Species Recorded n = Total Number of Individuals in the Sample i = Shannon's Diversity Index

### Example:

Find the species evenness value in a geographic area where the total number of species recorded is 230, the number of individual samples is 35 and Shannon's index is 25?

#### Solution:

Species Eveness = 25 /Ln ((230-1) / Ln(35))
= 6.002