Free Tool
A/B Test Statistical Significance Calculator
Enter visitors and conversions to calculate p-value, confidence interval, and uplift. No signup required.
1 Enter Results
Control
Variant
Advanced Settings
%Use 50 for a standard A/B split
2 Your Results
Statistical Significance
Significant
p = 0.0472
Threshold: α = 0.05 (95% confidence)
Control rate
4.50%
Variant rate
5.10%
Absolute lift
0.60 pp
Relative lift
13.33%
Confidence Interval (95%)
Absolute difference: [0.01 pp, 1.19 pp]
Relative uplift: [0.17%, 26.50%]
If the interval crosses 0 pp, the result is not statistically significant.
SRM check looks OK
SRM p-value is 1.0000 (expected control 50%).