Conversion Confidence Calculator
Conversion Confidence Level Calculator
Enter the number of visitors and conversions for each version.
What do the numbers mean?
If Version B is converting better than Version A and the confidence level is 91%, that means that going forward, there is a 91% chance that B will will convert better than A.
PLEASE NOTE:
The confidence level says nothing about the absolute conversion values for Version A and Version B.
In other words, if Version A is currently getting 1.5% conversion and Version B is getting 2.7% conversion, even if the confidence level is 99%, it does NOT mean that you can be 99% confident that B will get a 2.7% conversion rate.
It only means that you have enough data to be 99% confident that B converts better than A.
If you’re looking for a calculator that works the other way around (how long will it take to reach 95% confidence) check out Google’s own duration calculator at:
https://www.google.com/analytics/siteopt/siteopt/help/calculator.html
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