Sample Size Calculator
Calculate the required sample size for surveys and experiments based on population size, confidence level, and margin of error.
Enter Values
Enter 0 for unknown/infinite
Use 50% if unknown (most conservative)
Calculator insights
What this calculator does
Sample Size Calculator helps you quickly estimate calculate the required sample size for surveys and experiments based on population size, confidence level, and margin of error. with clean output and clear next steps.
How the calculation works
Enter Population Size, Confidence Level, Margin of Error and this calculator uses standard formulas to determine Required Sample Size. The output is displayed immediately in a user-friendly format.
Example calculation
For example, enter realistic values into the Sample Size Calculator to see how the calculator produces Required Sample Size that you can use for planning and comparison.
Disclaimer
The calculations provided by this website are for informational purposes only and should not be considered financial, legal, tax, or professional advice.
Frequently Asked Questions
What is margin of error?
The margin of error (±) indicates the range within which the true population value likely falls. A ±5% margin means if 60% agree, the true value is probably 55-65%.