Free tool
A/B test significance calculator
Paste visitor and conversion counts from control and variant to see lift, p-value, and whether you have reached your confidence threshold.
Not significant at 95% confidence yet
- Control rate
- 3.00%
- Variant rate
- 3.30%
- Relative lift
- 10.0%
- p-value (two-tailed)
- 0.2246
Two-proportion z-test with pooled standard error. For production experiments, RunPivot applies sequential testing and guardrails. Use this calculator for quick planning checks.
RunPivot monitors live experiments and calls winners at statistical significance. Start with RunPivot or explore live results in the product.