A/B Test Significance Calculator
Two-sided pooled two-proportion z-test with unpooled 95% difference interval. Small expected counts need an exact test; no causal guarantee.
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How to use this calculator
Enter the observed visitors and conversions for your control and variant groups, then run the tool. Compare the estimated conversion rates, difference and statistical evidence. A low p-value does not prove business impact or eliminate experimental bias.
Need to plan a future experiment? Use the A/B Test Sample Size Calculator first.