A/B Test Significance Calculator
Check if your A/B test result is statistically significant with a two-proportion z-test, p-value, lift and confidence level.
Variant A (control)
Variant B (treatment)
Two-tailed two-proportion z-test. Significant at 95% means there is less than a 5% probability the observed difference is due to chance. Avoid stopping tests early — decide sample size in advance.
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How to Use
Enter visitors and conversions for control (A) and variant (B). Significance at 95%/99%, p-value and relative lift update instantly.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.