A/B Test Significance Calculator
Compare two conversion rates, relative change, a p-value and an approximate 95% interval.
Free · No sign-up · Runs in your browser
Your result
Choose your settings, then run the tool to see the result.
How to use this tool
- Compare two conversion rates, relative change, a p-value and an approximate 95% interval.
- Choose the input and settings below. Example values can be replaced.
- Run the tool and check the preview and any notices.
- Download the result. Your original input files stay unchanged.
Scope & privacy
Two-sided two-proportion z-test at 5%, with an approximate 95% interval. Requires independent fixed-horizon samples; repeated peeking or multiple tests are not corrected.
No. Processing happens in your browser. No files, email content or calculation inputs are sent to our server.
What should I check before using the result?
Scope & privacy
Two-sided two-proportion z-test at 5%, with an approximate 95% interval. Requires independent fixed-horizon samples; repeated peeking or multiple tests are not corrected.
Are my inputs uploaded?
No. Processing happens in your browser. No files, email content or calculation inputs are sent to our server.
Put the result to work
Continue in your connected workspace to save, manage and use the result.