Sample Size Calculator

Infinite Population

Finite Population

Advanced

Approximates required sample size assuming a very large population.

Confidence Level (%)

Margin of Error (%)

Population Proportion (p)

Takes into account a known population size. Utilizes infinite population sample size as base, then applies finite population correction.

Confidence Level (%)

Margin of Error (%)

Population Proportion (p)

Total Population (N)

Specify Z-value directly or choose from pre-calculated confidence intervals, plus more advanced margin of error settings.

Choose Confidence or Enter Z-value

Z-value (if custom)

Margin of Error (%)

Population Proportion (p)

(Optional) Population Size