Sample Size Calculator

Published August 19, 2026

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Calculate the required sample size for your study

Confidence Level ?

Margin of Error (%) ?

Expected Proportion (%) ?

Population Size (Optional)

Required Sample Size

participants / subjects

✓

Confidence Level 95%

Margin of Error 5%

Expected Proportion 50%

Population Infinite

n = Z² × p × (1 − p) / E²

Where n = required sample size, Z = Z-score, p = expected proportion, and E = margin of error.

Note: If a finite population is entered, the calculator applies the finite population correction automatically.