Kappa Index Calculator


Calculators are essential tools for performing various mathematical computations with ease. In this article, we’ll introduce a simple yet powerful calculator implemented. This calculator is designed to calculate the Kappa Index, a statistical measure used to assess inter-rater reliability or agreement between two raters for categorical items.

How to Use

To use the Kappa Index calculator, follow these steps:

  1. Input the number of agreements (A) between the two raters.
  2. Input the number of disagreements (D) between the two raters.
  3. Click the “Calculate” button to compute the Kappa Index.


The Kappa Index (κ) is calculated using the following formula:


  • A = Number of agreements
  • D = Number of disagreements
  • n = Total number of ratings

Example Solve

Suppose there are 80 agreements and 20 disagreements out of a total of 100 ratings. Using the formula, we can calculate the Kappa Index:

So, the Kappa Index for this scenario is 0.75.


What is the Kappa Index used for?

The Kappa Index is commonly used in various fields such as medicine, psychology, and social sciences to measure the level of agreement between two observers or raters.

How is the interpretation of Kappa Index values done?

Interpretation of Kappa Index values can vary, but generally, values closer to 1 indicate higher agreement, while values closer to 0 suggest poor agreement beyond chance.

Is the Kappa Index affected by the prevalence of categories?

Yes, the Kappa Index can be influenced by the prevalence of categories in the data. Adjustments may be necessary in situations where the prevalence of certain categories is significantly skewed.


The Kappa Index calculator presented here offers a convenient way to compute inter-rater reliability using the Kappa Index formula. By inputting the number of agreements and disagreements, users can quickly obtain the Kappa Index value for their data.

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