Chi-Square Calculator for Test Statistics

Enter observed category counts and the expected counts for the same categories.

Expected count is in the denominator, so it cannot be zero.

For the Chi-Square Calculator, it uses the Chi-square statistic: chi-square = sum((observed - expected)^2 / expected). Compare observed category counts with expected counts.

For the Chi-Square Calculator, enter observed and expected counts. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.

Chi-Square Calculator calculates the selected statistic from the sample values provided. It uses the Chi-square statistic, but missing data, outliers, sample bias, and distribution assumptions can affect what the result means.

For the Chi-Square Calculator, check observed and expected counts, sample definition, missing values, outliers, and rounding precision. A statistic can be numerically correct but still describe a weak sample.