Statistics

P-value Calculator

Estimate a p-value from a test statistic and tail choice for common hypothesis-test setups.

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Input

Choose the test type, enter the test statistic, add degrees of freedom if needed, and pick the tail that matches your hypothesis. You will see the result first and the step-by-step solution below.

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Step by Step Calculation

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How to use P-value Calculator

Select the hypothesis-test family, enter the statistic, and the calculator will estimate the p-value for the tail you are testing.

What this calculator is for

This calculator is for inference problems and statistics coursework when you already have a test statistic and need the p-value that goes with the chosen distribution and tail.

Tips

Match the distribution type to the test statistic you actually computed.
Two-tailed tests split significance across both tails, so choose the tail carefully.
The p-value measures evidence against the null hypothesis; it is not the probability that the null hypothesis is true.