Z t Chi-square and F P-value Calculator
Evaluate explicit tail probabilities for four statistical distributions.
Your result
MATHEnter your values and select calculate.
On this page How it works & practical examples
How to use the Z t Chi-square and F P-value Calculator
Enter an already valid test statistic, its reference distribution and any required degrees of freedom. Two-sided mode is supported for symmetric z and t distributions. Use a single specified tail for chi-square and F.
The calculation
Worked example
z=1.96 has a two-sided normal-model p-value of about 0.0499957.
Assumptions and limits
No automatic choice of test, alternative, significance level or multiple-comparison correction. Floating-point approximations may lose precision in extreme tails; failures to converge produce input feedback.
Common questions
Which inputs should I use?
Convert an already valid z statistic to its normal tail probability. Choose the alternative specified by the analysis, rather than choosing a tail after seeing the result.
What does the result exclude?
No t, chi-square or F distributions. The normal CDF is approximate, and extreme tails may underflow or round to zero. No test assumptions or multiple-testing correction are inferred.