A/B Testing Calculator

Compare conversion rates.

Check lift and statistical significance for a control and variant.

Experimentation

A/B test significance

Compare two conversion rates with a two-proportion z-test.

Control

VisitorsConversions

Variant

VisitorsConversions

Confidence threshold

Control rate5.00%

Variant rate5.75%

Relative lift15.00%

Confidence98.1%

ResultVariant is ahead

Uses a two-sided two-proportion z-test. Statistical significance does not tell you whether an effect is large enough to matter.