Shannon Weiner Index Calculator




Introduction

The Shannon-Weiner Index is a widely used measure in ecology to quantify the diversity of a population or community. It takes into account both the richness (number of species) and evenness (distribution of individuals among species). Calculating the Shannon Weiner Index involves a straightforward formula, making it an essential tool for ecologists and researchers.

How to Use

To make the calculation more accessible, we’ve created a simple HTML and JavaScript calculator. Follow the instructions below to utilize the calculator:

  1. Input the number of individuals for each species in the provided text boxes.
  2. Click the “Calculate” button to obtain the Shannon-Weiner Index.

Formula

The Shannon-Weiner Index (H) is calculated using the formula:

Where:

  • H is the Shannon-Weiner Index.
  • S is the total number of species.
  • pi​ is the proportion of individuals in the i th species.

Example Solve

Suppose we have three species with the following number of individuals:

  • Species A: 20 individuals
  • Species B: 15 individuals
  • Species C: 10 individuals

The proportions (pi​) are calculated by dividing the number of individuals in each species by the total number of individuals (45 in this case).

Substitute these values into the formula to find H.