A/B Test Significance Calculator

Free a/b test significance calculator with instant results, powered by AI.

Control visitors10–10000000

Control conversions0–10000000

Variant visitors10–10000000

Variant conversions0–10000000

✨ Your Result

LIFT · variant vs control

Control Rate4

Variant Rate5

Confidence98.8

Z-Score2.41

Yes — statistically significant. Variant converts at 5% vs control at 4% — a 25% lift with 98.8% confidence.