Calculate the required sample size for a survey or study using confidence level, margin of error, and population proportion.
The calculator uses the standard sample size formula for proportions:
n = (Z² × p × (1 − p)) / E²
Where:
• Z = Z‑score for confidence level (e.g., 1.96 for 95%)
• p = estimated population proportion (0–1)
• E = margin of error (0–1)
Z = 1.96 p = 0.5 E = 0.05 Possible Output: Required Sample Size = 384.16