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Statistics

Sample Size Calculator

Estimate the sample size needed for a survey or study.

Preparing Sample Size Calculator

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Input

Use confidence level, margin of error, and population proportion. You will see the result first and the step-by-step solution below.

Input summary

Your calculator summary shows here.

Step by Step Calculation

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Step by step calculation shows here

Calculate first and the full working will appear below automatically.

How to use Sample Size Calculator

Enter the values you know, tap Calculate to see the result first, then review the optional step-by-step solution below.

What this calculator is for

Use confidence level, margin of error, and population proportion.

Tips

Use clean numbers and symbols so the solver reads them correctly.
For lists, separate numbers with commas, spaces, or new lines.
For matrices, put each row on a new line.

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