A/B Testing Statistical Significance & Sample Size Calculator
Determine if your marketing experiments and CRO tests reached true statistical significance. Calculate two-tailed p-values, z-scores, percentage uplift, and minimum sample size needed before calling a winner.
⚖️ Interactive A/B Testing Statistical Significance Calculator
Verify whether your landing page or ad creative test is mathematically valid or just random variance.
Variation A (Control / Original)
Variation B (Challenger / New Variant)
A/B Testing Rules & Minimum Sample Thresholds
Standard operating procedures for validating conversion hypotheses without risking budget.
| Test Type | Minimum Conversions / Var | Recommended Confidence | Minimum Duration | Common Pitfalls |
|---|---|---|---|---|
| Ad Creative Variations (Meta/TikTok) | 50 – 100 conversions | 90% – 95% | 7 days | Audience overlap between ad sets contaminating samples |
| Landing Page Headlines & Offers | 150 – 300 conversions | 95% | 14 days | Weekday vs weekend conversion rate skew |
| Checkout Funnels & Pricing Tiers | 400+ conversions | 99% | 14 – 28 days | Seasonality and pay-cycle conversion spikes |
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