๐P-Value Calculator
Convert a z, t, chi-square, or F statistic into a p-value, with a shaded distribution graph.
Free P-Value Calculator
Already have your test statistic and just need the p-value? Our free P-Value Calculator converts a z-score, t-statistic, chi-square statistic, or F-statistic into a p-value instantly โ with a shaded distribution graph so you can see exactly what's being measured.
Choose your statistic type, enter the value and degrees of freedom (where needed), pick left-tailed, right-tailed, or two-tailed, and get an accurate p-value along with significance flags at the common 0.05, 0.01, and 0.001 thresholds. No more flipping through printed distribution tables or interpolating between rows.
Built for students and researchers who've already run a test and need the final piece โ an accurate p-value with a clear visual. Free, no sign-up, no limits. See the About page or the FAQ for more.