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 to use.
What do I need to enter to use the Sample Size Calculator?
The Sample Size Calculator asks for the following values (3): Population (0 = very large), Margin of error (%), Confidence level. Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Sample Size Calculator?
The Sample Size Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Sample Size Calculator free, and do I need an account?
Yes. The Sample Size Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.