Calculate required sample size for surveys, research studies, and statistical analysis
Our sample size calculator helps researchers, marketers, and analysts determine the optimal number of participants needed for surveys, studies, and statistical analysis. Get accurate sample size calculations based on your population size, desired confidence level, and margin of error.
Our calculator uses the standard statistical formula for sample size determination:
n = (Z² × p × (1-p)) / E²
Where: Z = Z-score, p = expected proportion, E = margin of error
Lower percentage = more precise results but larger sample needed
50% gives the maximum sample size (most conservative estimate)