P Value Calculator

Use this free P value calculator to determine statistical significance in hypothesis testing. Enter your test statistic and sample size to quickly calculate the P value.

P Value Calculator Tool

Test Statistic: Degrees of Freedom: Calculate

What Is a P Value?

The P value measures the probability that the observed data occurred by chance under the null hypothesis. A smaller P value indicates stronger evidence against the null hypothesis.

P Value Formula

The P value is calculated using the cumulative distribution function of the test statistic.

Example Calculation

Suppose a t-test produces a test statistic of 2.1 with 20 degrees of freedom. Using the t distribution table, the corresponding P value can be calculated.

Frequently Asked Questions

What is a significant P value?

A P value less than 0.05 is commonly considered statistically significant.

What does a large P value mean?

A large P value indicates that the data is consistent with the null hypothesis.