A/B Test Significance Calculator
Enter visitors and conversions for your control and variant. Get conversion rates, relative uplift, p-value and confidence using a two-tailed z-test.
A - Control
Conversion rate: 5.00%
B - Variant
Conversion rate: 6.20%
Relative uplift (B vs A)
+24.00%
Confidence
99.1%
p-value
0.0091
z-score
2.61
Absolute diff
1.20 pp
Statistically significant at 95% confidence - variant B wins.
How it works
Enter the visitor and conversion counts for your control and variant. The calculator runs a two-proportion z-test to give you the relative uplift, p-value and confidence level. A result below your chosen significance threshold means the observed difference is likely real, not random noise.