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Sample Size Calculator

Statistics

Sample Size Calculator

Sample size for a proportion estimate.

Expected proportion (%)

Margin of error (%)

z

Sample size n

How it works

n = z² p (1−p) / e² for a proportion.

Enter Expected proportion (%), Margin of error (%), and z for the Sample Size Calculator; enter percentage fields as percentage points. The calculator reports Sample size n: n = z² p (1−p) / e² for a proportion. Expected proportion and Margin of error must be entered as percentages, with a positive margin.

\[ n=\frac{z^{2}p(1-p)}{e^{2}} \]

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