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.