Purpose: work out how many respondents you need for a study. Choose the design that matches your objective — a simple prevalence survey, a comparison of two groups, or a coverage/LQAS assessment — enter the parameters, and get the required sample size with non-response and design-effect adjustments.
Enter parameters and calculate.
Detect the difference between the two proportions.
For a continuous outcome.
| If your objective is… | Use |
|---|---|
| Estimate one indicator (e.g. % enrolled, % literate) | Proportion survey |
| Compare a result between two groups or two time points | Compare two groups |
| Estimate an average (score, age, distance) | Estimate a mean |
| Classify coverage as acceptable / not (rapid) | LQAS — see the full decision tool |