Statistics
Sample Size Calculator
Sample size for a proportion estimate.
Free to use — no sign-up or login.
Sample size n
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This free Sample Size Calculator covers Sample size for a proportion estimate.
n = z² p (1−p) / e² for a proportion. Related statistics tools sit beside How it works, with no account required.
Using the Sample Size Calculator
Sample size for a proportion estimate. Typical inputs are Expected proportion (%), Margin of error (%) and z. How it works beside the form states the identity the Sample Size Calculator applies.
FAQ
How do I use the Sample Size Calculator?
Open the Sample Size Calculator, fill Expected proportion (%), Margin of error (%) and z, and read the result. 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.
What formula does the Sample Size Calculator use?
The Sample Size Calculator uses the identity in How it works. In words: 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.