📉 P-Value Calculator
Calculate p-value from z-score or t-score for hypothesis testing
About this calculator
The P-Value Calculator interprets statistical test results. Enter your test statistic and choose the distribution — z, t with degrees of freedom, or chi-square — plus one- or two-tailed; it returns the p-value, the probability of seeing results this extreme if the null hypothesis were true. Below your alpha level, typically 0.05, the result is statistically significant.
Tip: a p-value says nothing about effect size or practical importance — always report it alongside the actual difference measured, because tiny trivial effects become significant with enough data.