A/B test significance

A/B Test Significance Calculator

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Variant A visitors

Variant A conversions

Variant B visitors

Variant B conversions

Two-proportion z-test → two-tailed p-value

Checks whether the difference between two variants is real or just noise. A p-value below 0.05 means 95% confidence the winner is genuine.

95% significant

Lift · B vs A

+24.0%

B's 6.20% beats A's 5.00%, significant at 95% (p = 0.009).

Variant A rate5.00%

Variant B rate6.20%

p-value0.009