Sample size calculator
Choose the study type first, then choose with or without replacement. The table and calculator below update to show only the selected method.
General Steps of Sample Size Calculation
| Type | With Replacement |
|---|---|
|
Type
Single Proportion
|
With Replacement
n = (Z² p q) / d²
|
Tip: sampling with replacement ignores finite population correction. Sampling without replacement uses the finite population size N.