Sample Size Calculator

Calculate the sample size needed for your research study.

Parameters

Confidence Level:

90%95%99%

Margin of Error (%):

Common values: 1%, 2%, 3%, 4%, 5%, 10%

Population Size (optional):

Leave blank for infinite population

Estimated Proportion (p):

Use 0.5 for most conservative (largest) sample size

Enter your parameters and click Calculate to see the required sample size.