A/B test significance
Enter visitors and conversions for variants A and B — the calculator tells you whether the difference is statistically significant or you need more data.
Variant A (control)
Variant B (test)
Uses a two-tailed z-test for two proportions. Significance threshold — 95 % (p < 0.05). The lower the p-value, the less likely the difference is random.
A: 1000 / 48 → B: 1000 / 63…
Need a deeper look?
The tool shows symptoms — I find causes. I set up analytics, ads and the technical side so the numbers add up.