How this calculator works
Use n = (z * sigma / E)^2 to approximate sample size needs for surveys and studies.
Formula
Sample Size Calculator formula based on your input values.
Step-by-step
- Enter the required input values.
- Review fields such as estimated standard deviation, desired margin of error, confidence level.
- Click Calculate to see the output instantly.
Example
- Enter your values in the form fields
The result appears in the output panel.
FAQs
Is the sample size calculator accurate?
The calculator applies deterministic formulas directly to your inputs.
Can I use decimals?
Yes, decimal inputs are supported where relevant.