Free business calculator
A/B Conversion Comparison Calculator
Compare two conversion rates and see whether the gap is clear or still noisy.
- Instant results
- Private in your browser
- PDF report included
Use the result well
A clear answer, with the assumptions visible
These recommendations turn the result into an operational next step without hiding the inputs behind a score.
- 1
Use one planned outcome and a fixed stopping rule.
- 2
Check that A and B received comparable traffic.
- 3
Consider business value as well as statistical clarity.
How this tool works
- Calculate each version’s conversion rate.
- Use jStat’s normal distribution for a two-sided proportion test.
- Show the rate gap, p-value, and confidence range together.
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