If you are conducting an employee survey or a customer survey with a large number of potential respondents, it might make sense to survey only a portion of the population. Our article on random sampling explores this topic and explains the concepts used in the calculators on this page. If you have not yet conducted your survey and you want to calculate how many people you need for your random sample, use calculators #1 and #2 below. If you already conducted your survey and you want to know how accurate your data are given the number of responses you received, scroll down and use calculator #3. #1  How many survey respondents do you need?
Specify your desired error level and population size below and click calculate. The numbers next to each confidence level indicate how many people need to complete your survey to achieve the specified error level.


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