A/B Test Significance Calculator
Enter visitors and conversions for two variants and get the conversion rates, relative lift, z-score, p-value and whether the result is significant at your chosen confidence level.
Runs 100% in your browser · nothing you enter is uploaded
How to use it
- Enter visitors and conversions for A and B.
- Choose confidence level and one- or two-tailed test.
- Read the verdict and confidence interval.
Questions
Which test is used?
A pooled two-proportion z-test; the interval uses the unpooled standard error.
How many visitors do I need?
Use the sample-size panel: it estimates visitors per variant to detect your target lift with 80% power.
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