Free A/B test calculator
Compare two versions of an ad or page and see whether the difference is likely real or just chance. Runs in your browser; nothing you type is sent to us.
A conversion is a lead, a sale or a click on the goal you chose. Run the test until each version has enough visitors.
Using the A/B test calculator in three steps.
- Enter the visitors and the conversions for version A and version B.
- Read the conversion rates and the result.
- If the result is unclear, keep the test running to collect more data.
About the A/B test calculator.
What does the calculator test?
It compares two conversion rates with a standard two-proportion z-test and tells you how likely the difference is to be chance.
What counts as a confident result?
A common rule is 95 percent confidence. Smaller samples need larger differences to be trusted.
Should I stop a test as soon as one side leads?
No. Decide the sample size first. Stopping early can make a chance gap look real.
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