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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.