Enter the values for your control (A variant) and experiment (B variant) in the form below. Impressions might also be called be views or visitors depending on what you're testing.
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About the A/B Split Test Calculator
This tool was built over a few days when I was annoyed with the slowness of existing ab calculators.
Wanting to make speed as the core feature, I knew using JavaScript in the browser was going I be the best option. Plus it makes the tool feel faster since results are shown right away, instead of waiting on a server to process them.
I want to credit Patrick McKenzie with the algorithm for finding the statistical significance. His open source library ABingo is great for running A/B tests in Ruby on Rails applications and I ported his Ruby implementation to JavaScript for this tool.