Sample size calculator

Using the sample size calculator below, you can easily calculate various sample sizes using the error margin and the reliability level. The minimum required sample size will be calculated automatically plus some alternative scenarios. Done calculating? Compute the price per complete, when it concerns consumers, using our convenient price calculator.

How big is the error margin you wish to allow?
The error margin you allow often depends on the design of the research. The sample size that is calculated below guarantees this margin.		  %
What reliability level do you wish to use?
Statements about the results are made on a basis of 95% reliability, which means that the results will be accurate in 19 out of 20 cases. 		 90%
 95%
 99%
What outcome do you expect in your research?
What outcome do you expect for every question? If you cannot know or estimate this, use 50%. In this case the calculated sample size is the biggest.		  %
The required sample size is: 385
Alternative scenarios
Sample size:
Error margin: 9.8% 6.93% 5.66%

Reliability level: 90% 95% 99%
Sample size: 271 385 664

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