Sample Size Calculator
Find the sample size needed for a survey.
Result
Results are estimates for general information only and are not professional advice.
Choosing a sample size
To get reliable survey results you need an adequate sample. This calculator computes the required number of responses from your desired margin of error, confidence level and population size (with a finite-population correction).
Frequently Asked Questions
What is the Sample Size Calculator?
Find the sample size needed for a survey. It runs instantly in your browser and is completely free.
Is the Sample Size Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Sample Size Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.