← All toolsMarketing
A/B Test Significance Calculator
Check whether an A/B test result is statistically significant, see the uplift and confidence, and plan how many visitors a test needs.
Tip from Tink: Don't stop a test the moment it turns significant — decide the sample size first.
Result
B wins
Confidence
98.77%
Uplift (B vs A)
16%
Rates A / B
5% / 5.8%
Significant means at least 95% confidence (two-sided test).
Planning a test? Sample size
Visitors per variant
31,231
Advertisement
How to use the A/B Test Significance Calculator
- Enter visitors and conversions for A and B.
- Read the winner, confidence and uplift.
- Use the sample size box to plan your next test.
Everything runs in your browser. Nothing you enter is uploaded.