Sample Size Calculator

Calculate required sample size for surveys and experiments

Calculate the required sample size for surveys and experiments based on confidence level and margin of error

Confidence Level

Margin of Error (%)

Expected Proportion (%)

Use 50% if unknown (most conservative)

Population Size (optional)

385

Required Sample Size

1.9600

Z-score

95%

Confidence

5.0%

Margin of Error

50%

Proportion

Formula

n = (Z^2 * p * (1-p)) / E^2 = (1.9600^2 * 0.50 * 0.50) / 0.0500^2 = 385