Growth maths · Free
A/B Test Significance Calculator
Is your winner real? Plus the sample size you need.
Significant: B is the winner at 97% confidence.
To detect a 10% relative lift from a 5.0% baseline (95% confidence, 80% power), you need about 29,792 visitors per variant.
How to use it
- Enter visitors and conversions for A and B.
- Only call a winner at 95% confidence or higher.
What good looks like
- 95%+ confidence and enough conversions (100+ per variant) before deciding.
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