Sample Size Calculator
Answer three questions and find out how many responses you need for results you can trust.
responses needed
How this works
This uses the standard formula for estimating a proportion with a given confidence level and margin of error, assuming the most conservative case (50/50 split in the underlying population, which requires the largest sample). If you provide a population size, the calculation applies a finite population correction — smaller populations need proportionally fewer responses to reach the same confidence.