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Fisher exact probability calculator

  Category 1 Category 2
Group 1
Group 2


Fisher's Exact Test is used to determine whether or not there is a significant association between two categorical variables. It is typically used as an alternative to the Chi-Squared Test (2x2 table) when cell counts are small.


When the (two-sided) P-value (the probability of obtaining the observed result or a more extreme result) is less than the conventional 0.05, the conclusion is that there is a significant relationship between the two classification factors Group and Category.


  • Altman DG (1991) Practical statistics for medical research. London: Chapman and Hall.

How to cite this page

  • MedCalc Software Ltd. Fisher exact probability calculator. (Version 22.023; accessed May 29, 2024)

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