Split Test Calculator & Decision Tool

The calculator below can be used to interpret the results of a usability-oriented split (A/B) test. This is a basic scenario where you have two groups of Visitors (A & B) who each get to see one version of your website and for whom you track the number of Conversions or Goals (purchases, downloads, click-throughs, etc.).

This calculator is based on the Chi-Square (Χ²) statistic. There are, admittedly, other Chi-Square calculators out there, so what makes this one different?

• Usability-oriented language
• Automatic calculation of Conversion Rates
• Clear explanations of results
• Confidence levels for significant results
• Suggestions for tests that haven't reached significance

Simply enter the number of unique Visitors for each group and total Goals or Conversions for that group below, and click [Calculate] for your results.

For more information on conversion rates and split testing, you may be interested in my article, Measuring Usability: The Basics.