✓ Effortless Math · Free Tool

P-value Calculator

Convert a z, t, or chi-square test statistic into a p-value — one-tailed or two-tailed — with a significance check against α = 0.05 and step-by-step working.

From a z, t, or χ² statistic → the p-value
z df

Enter the test statistic. For t and χ², also enter the degrees of freedom.

Results

p-value
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Test
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Statistic
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Tail
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vs. α = 0.05
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Step-by-step