Chi-Square Distribution Calculator

Sets the shape of the χ² distribution; its mean equals df.

For a test of independence use (rows − 1) × (columns − 1); for a goodness-of-fit test use the number of categories minus 1.

The χ² statistic to evaluate. The tool reports the right-tail probability of a value at least this large, which is the usual p-value for χ² tests.

The significance level as a decimal, e.g. 0.05 for 5%. The tool returns the critical χ² value that a test statistic must exceed at this level.