MDE calculatorThis form calculates the Minimum Detectable Effect for an AB test.
Enter the number of visitors you have and the conversion rate of the page you want to test, then clic on the run button...
You will get the size of the Minimum Detectable Effect of your experiment.
Total number of visitors :
Initial conversion rate : %
Minimal Detectable Effect :
Feel free to ask questions in the comment section or via twitter (@hwassner).
Go to the AB Tasty website for a nicer interface of that tool.