A/B Test Significance Calculator

A/B Test Significance Calculator
Enter Your A/B Test Data
A
Variant A
Your control / original
Total people who saw this variant
Clicks, leads, purchases — your goal action
B
Variant B
Your challenger / new version
Total people who saw this variant
Clicks, leads, purchases — your goal action
Confidence Level Required
95% means there is only a 5% chance your result is due to random variance. 99% is stricter — use it for high-budget decisions.
Test Results

Conversion Rate Comparison
VARIANT A --
VARIANT B --
Statistical Confidence Achieved
--
Relative Uplift (B vs A)
--
How much better or worse Variant B performs relative to Variant A. Positive means B converts at a higher rate.
Z-Score
--
The statistical distance between the two variants. Above 1.96 = 95% confident. Above 2.58 = 99% confident. Below 1.65 = inconclusive.
Sample Size Assessment
AAA Programs

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