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%
Relative uplift
+24.00%
Confidence
99.1%
p-value
0.0091
z-score
2.61
Absolute diff
1.20 pp
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.
Basic guide
Enter the visitors and conversions for your control and variant.
The calculator compares the two conversion rates and reports relative uplift, absolute difference, p-value, confidence and z-score using a two-proportion z-test.
Example
Control: 1,000 visitors, 50 conversions Variant: 1,000 visitors, 62 conversions
The calculator compares the 5.0% control conversion rate with the 6.2% variant conversion rate and reports the resulting uplift and statistical significance.
Use the result to understand whether the observed difference is statistically distinguishable from random variation.