Do you need **calculate the sample size**? Use our online calculator and you will be able to get the right sample size for the population you want to investigate.

To use the **sample size calculator** you only need to fill in four essential pieces of information: the size of the population, the percentage of deviation, the maximum percentage of error that you allow and the confidence level. If you don't know what these parameters are, read on to get a good understanding of how to calculate a sample size.