Critical Value Calculator

Choose a distribution, alpha level, tail type, and degrees of freedom to calculate common statistical critical values.

Distribution

Alpha (α)

Tail

Degrees of freedom

—Critical value

—Lower critical

—Upper critical

—Central confidence

—Critical values are quantiles of the selected reference distribution.

How to use this Critical Value Calculator

Find critical values for normal, t, chi-square, and F distributions. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.