Statistics

Sample Size Calculator

Determine the minimum sample size needed to estimate a mean or proportion with a given margin of error and confidence level.

Live Calculator · Step-by-Step · Statistics

Inputs

Estimating

Margin of Error (E)

Population SD (σ)

Estimated pÌ‚ (use 0.5 for conservative)

Confidence Level (%)

Result

Enter values and calculate.

Step-by-Step Work

Your explanation will appear here.

n vs. Margin of Error

Put It Into Practice

The calculator shows the steps — a quiz proves you can do them on your own.

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