5% is a common choice

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The margin of error is the amount of error that you can tolerate.
Lower margin of error requires a larger sample
size.

Typical choices are 90%, 95%, or 99%

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The confidence level is the amount of uncertainty you can
tolerate.
Higher confidence level requires a larger sample size.



How many people are there to choose your
random sample from?

Leave this as 50%

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For each question, what do you expect the results to be?

Your recommended sample size is 

This is the estimated minimum recommended sample size of your survey. If you create a sample of this many individuals and receive answers from everyone, you're more likely to obtain a right answer than you would from a big sample when just a tiny proportion of the sample responds to your survey. 