Free online sample size calculator

Pick one of the two online calculator tools depending on whether you have completed an A/B split email marketing campaign or are planning a new one.

  1. Result Check. Check results given a sample size for a completed A/B test
  2. Plan sample size. Calculate a suitable sample size for a new email marketing A/B test

The sample size calculator tools are quick and easy to use.

The result check is perfect to take open, click or conversion percentage rate results from an A/B split email test and determine if they are significant given the size of your sample.

Use the plan sample size calculator if you need to work out what size of list or sample you should use for a A/B test. Normally you will want to use as small a sample as possible so that further tests can be made or the email variant with best repsonse can then be sent to the remaining list data.