Statistical Significance Calculator

No — this tool runs the exact same two-proportion z-test on the same four inputs (conversions and visitors for groups A and B). It's listed separately for people who search 'statistical significance' rather than 'A/B test,' but the calculation is identical.

It measures how many standard errors apart your two conversion rates are. The result is flagged significant at 95% confidence when the absolute z-score exceeds 1.96.

This calculator's significance check is fixed at the 95% (z=1.96) threshold — it reports the z-score and lift so you can compare against a stricter threshold yourself if needed, but the pass/fail verdict shown is always for 95%.

The z-test formula accounts for unequal sample sizes in its pooled-variance calculation, so you can enter mismatched visitor counts for A and B without issue.