Free Rowform tool

Free Chi-Square Calculator

Test whether two categorical variables are independent with a configurable contingency table.

Rowform free toolPrivate · runs in your browser

How to Use This Chi-Square Calculator

Choose a table size from 2 × 2 up to 6 × 6.
Enter a non-negative observed count in every cell.
Calculate the statistic, degrees of freedom, p-value, and interpretation.

What is a chi-square test?

A chi-square test of independence compares observed counts with the counts expected if two categorical variables were unrelated. A small p-value indicates evidence of an association.

The Formula

χ² = Σ (Observed - Expected)² ÷ Expected

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Frequently Asked Questions

Can I enter percentages?

No. Enter observed frequency counts. Percentages do not retain the sample-size information required by the test.

What if expected counts are small?

The usual approximation can be unreliable when expected cell counts are below 5. For a small 2 × 2 table, consider Fisher's exact test.