Prevalence Sample Size Calculator
Estimate sample size for a prevalence study with optional finite population, design effect, and non-response adjustment.
Help notes
Use proportions, not percentages. For example, enter 0.2 for 20% expected prevalence and 0.05 for a 5 percentage-point margin of error.
Input
Enter values and review the calculated outputs.
Results
Base sample size
Not available
Finite-population corrected sample size
Not available
Design-adjusted sample size
Not available
Final sample size after non-response adjustment
Not available
Interpretation
This calculator uses the standard single-proportion sample size formula. Treat the result as a planning estimate and document the assumptions used.