Fisher’s Exact Test Calculator
Test the association in a 2×2 table when expected counts are too small for the chi-square test.
Updated · By Bibin XavierData 90 × 12
| IDtext · 90 levels | Grouptext · 3 levels | Gendertext · 2 levels | Agenumeric | Hours_Studynumeric | Anxietynumeric | Motivationnumeric | Pre_Scorenumeric | Post_Scorenumeric | Exam_Scorenumeric | Passednumeric · coded | Satisfactionnumeric · coded |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S001 | Control | Male | 23 | 11.2 | 29 | 4.6 | 60 | 62 | 67 | 1 | 2 |
| S002 | Workshop | Female | 23 | 3.9 | 28 | 3.5 | 54 | 70 | 54 | 0 | 2 |
| S003 | Online | Female | 18 | 10.1 | 32 | 4 | 55 | 57 | 66 | 0 | 3 |
| S004 | Control | Male | 26 | 13.6 | 41 | 3.5 | 52 | 55 | 59 | 0 | 3 |
| S005 | Workshop | Female | 22 | 9.7 | 27 | 3.6 | 56 | 63 | 65 | 0 | 4 |
| S006 | Online | Female | 20 | 7.9 | 32 | 3.8 | 65 | 82 | 65 | 0 | 2 |
| S007 | Control | Female | 20 | 6.3 | 28 | 3 | 72 | 83 | 61 | 0 | 3 |
| S008 | Workshop | Male | 22 | 8 | 29 | 3.1 | 64 | 72 | 62 | 1 | 3 |
Variables and options
Results
Calculated in your browser2×2 table
| Outcome yes | Outcome no | Total | |
|---|---|---|---|
| Exposed | 9 | 3 | 12 |
| Unexposed | 2 | 10 | 12 |
| Total | 11 | 13 | 24 |
Test results
| Statistic | Value |
|---|---|
| Fisher’s exact p (two-sided) | .012 |
| One-sided p (OR < 1) | 1.000 |
| One-sided p (OR > 1) | .006 |
| Odds ratio | 15.000 |
| 95% CI for OR (Woolf, +0.5) | [1.80, 72.15] |
| Pearson χ² (for reference) | 8.22, p = .004 |
Interpretation
The association is statistically significant. The odds of the outcome are 15.00 times as high in the exposed group.
How to cite this tool
Using these results in a thesis, journal article, report or class assignment? Please cite this free tool so others can find it. It keeps the site free.
APA 7
Xavier, B. (2026). Fisher’s Exact Test Calculator [Web application]. FreeStatisticalTools.com. https://freestatisticaltools.com/fishers-exact-test-calculator/
BibTeX
@software{xavier_fisherexacttest_2026,
author = {Xavier, Bibin},
title = {Fisher’s Exact Test Calculator},
publisher = {FreeStatisticalTools.com},
year = {2026},
url = {https://freestatisticaltools.com/fishers-exact-test-calculator/},
note = {Web application}
}Suggested sentence for your methods section: “The analysis was carried out with the free Fisher’s Exact Test Calculator tool on FreeStatisticalTools.com (Xavier, 2026).”
What is Fisher’s exact test?
Fisher’s exact test calculates the exact probability of a 2×2 table under independence. Use it instead of the chi-square test when expected counts are small.
When to use Fisher’s exact test
Use it for 2×2 tables when any expected count is below 5.
How to use this calculator
- Enter the values. Fill in exposed, outcome yes (a), exposed, outcome no (b), unexposed, outcome yes (c), unexposed and outcome no (d).
- Read the results. Results update automatically. Read the plain-English interpretation, then use Copy table to paste APA-style tables into Word and Copy for the results sentence.
How to report Fisher’s exact test in APA style
“Fisher’s exact test, p = .012, OR = 15.0.”
Frequently asked questions
When should I use Fisher’s exact test?
When any expected cell count in a 2×2 table is below 5, typically with small samples.
How is the two-sided p-value calculated?
It sums the probabilities of all tables with the same margins that are as likely or less likely than the observed table, the method used by R and SPSS.
What does the odds ratio show?
How many times higher the odds of the outcome are in the first row than in the second.
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