WHO Cluster Survey Calculator
30 x 7 EPI Cluster Survey Design - Standard WHO sample size calculation
Survey Parameters
SRS Sample
97
Cluster-Adjusted
146
Per Cluster
5
Total (adj. NR)
180
n = DEFF x z squared x p(1-p) / d squared = 1.5 x 1.96² x 0.5x0.50 / 0.1² = 146
Standard Designs Comparison
| Design | Clusters | Per Cluster | Total |
|---|---|---|---|
| WHO 30x7 (Classic) | 30 | 7 | 210 |
| WHO 30x7 (Updated) | 30 | 7 | 210 |
| Your Design | 30 | 5 | 150 |
| Large Survey | 60 | 3 | 180 |
Recommendations
Feasible sample size
NormalTotal of 180 households. Standard 30x7 design is practical for most field teams.