P-value Calculator

Z-score to p-value with one/two-tailed test and significance check.

Input Parameters

Z-score

Test tails

P-value0.04999564347

α = 0.05Significant

α = 0.01Not significant

175 available

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A p-value calculator converts a z-score into a p-value for one-tailed or two-tailed tests and flags significance at α = 0.05 and 0.01.

What is a p-value?

The probability of a result at least as extreme as observed, assuming the null hypothesis is true.

One-tailed vs two-tailed?

One-tailed tests a directional claim; two-tailed tests any difference and doubles the one-sided p.

When is it significant?

Conventionally when p is below 0.05 (or 0.01 for strong evidence) — the calculator flags both.