A/B Test Sample Size Planner

How many visitors does each version need before you can trust the result? Enter your current conversion rate and the smallest lift you care about.

FreeNo sign-upRuns in your browser

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How to use it

  1. Add your inputType or paste your input. Many tools already show an example you can change.
  2. Press Run toolThe result appears right below the button.
  3. Copy or downloadUse Copy output, or the Download button for files.

This tool works inside your browser: what you enter stays on your device.

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