Estimate a simple survey sample size for a proportion using confidence level, margin of error and expected proportion.
Result: Enter assumptions.
Formula used
For a large population, n0 = z²p(1−p)/e². If a finite population is entered, the usual finite-population correction is applied.
Statistical limitation
This assumes a simple random sample and a proportion estimate. Real studies may need design-effect, nonresponse, clustering, stratification or power-analysis adjustments.