P-value Calculator

• z statistic: from tests based on the normal distribution, e.g. proportion tests.
• t statistic: from t-tests; needs degrees of freedom.
• χ² statistic: from chi-square tests; needs degrees of freedom.
• F statistic: from ANOVA or variance-ratio tests; needs numerator and denominator df.

The value your test produced — e.g. 1.96 from a z-test. The tool converts it into the corresponding left-, right- and two-tailed p-values.

The degrees of freedom of the t or χ² distribution — typically set by your sample size or table dimensions, e.g. n − 1 for a one-sample t-test.

The numerator degrees of freedom of the F statistic — in a one-way ANOVA, the number of groups minus one.

The denominator degrees of freedom — in a one-way ANOVA, the total sample size minus the number of groups.