Conversion Testing Tool To Estimate Necessary Sample Size Required

This tool is designed to give you an estimate of the number of impressions and the amount of time it will take to reach a satisfactory sample size. It may be used for conventional A/B Split Tests with two or more treatments, and also for a Final Split Test after you have alrady conducted a full factorial (Multivariate) or fractional factorial (Taguchi) type of test and are now confirming your test results.
Minimum Conversion Difference You Wish To Detect: %
Average Success Rate of Control: %
Degree of Confidence: %
New Arrivals Per Day:
Number of Treatments, Including Control:

- Interpretation -

Simply plug in the information requested above and click the Proceed button. The tool will analyze your input and make the best guess at the amount of time and amount of traffic it will take to reach a conclusive sample size.

Note however that all this tool can do is provide a pre-test Estimate. Since it cannot see the level of divergence between your test treatments you should use it only as a rough guide to determine how long a test needs to run. You should still default back to your actual test data, making sure you have reached a conclusive outcome.

If the testing tool you use does not provide you with a Confidence factor so that you can determine the usefulness of a test, please use the Conversion Confidence Tool.