Sample size calculator
Calculate the number of respondents needed in a survey using our free sample size calculator. Our calculator shows you the amount of respondents you need to get statistically significant results for a specific population. Discover how many people you need to send a survey invitation to obtain your required sample. You can also calculate the margin of error based on your sample size.
Calculate representative sample size
Calculate sample size margin of error
After your survey is complete and you know the number of respondents you actually have, you can use this calculator to determine the actual margin of error.