Significance
A/B Test Calculator
Sample size, statistical significance and confidence intervals — done right, not the duty-free version.
— CategoryAnalytics & Intelligence
A
Control (Variant A)Conversion Rate
4.00%
B
Variant (Variant B)Conversion Rate
5.20%
Result
No significant winner yet
Need more data — currently at 93.0% confidence
Statistical Confidence
93.0%
Need 2.0% more
Uplift (B vs A)
+30.0%
Relative improvement
Conversion Rate Comparison
Variant A (Control)4.00%
80 / 2000
Variant B (Test)5.20%
104 / 2000
Statistical Details
Z-Score
1.811
P-Value
0.0701
95% CI Lower
-0.10%
95% CI Upper
2.50%
Recommended sample size
Run at least 4,779 visitors per variant for 80% power at 95% confidence.
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