Split Test Duration Calculator

How long will it take to run an A/B split test before I know the test results are valid?

This A/B split test calculator will help you to know estimated duration and the amount of traffic you will need before you'll know whether the results of your split test is statistically valid.

When performing A/B split or multivariate tests, it's easy to jump to conclusions prematurely. Results are only valid if the test has been running long enough to provide statistical significance. After all, what good is a 50% increase in conversion rate if you're only 5% sure that the results are accurate? Using statistics you can determine how big of a sample size you will need.

Luckily this calculator does all the math for you so you don't need to deal with the complicated formulas. Next time you're going to start a test, be sure to determine how long you need to run it by coming here first!