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Marketing & Product
A/B Test Significance Calculator
Test whether a difference in conversion rate between two variants is statistically significant.
Variant A (control)
Variant B (test)
Rate A → B
10.00% → 12.50%
+25.0% relative
p-value
0.0769
Result
Not significant
at 95% confidence
Uses a two-proportion z-test, two-tailed. Treat this as a directional read, not a substitute for running the test to a pre-committed sample size — stopping early because a result looks significant inflates your false-positive rate.