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        Proportions Test


Response Rate

Sample Size

Means Calculator



Sample Size Calculator

The Sample Size Calculator allows you to determine the number of people you will need to interview to get precise results that reflect your target population.

Confidence Level
(95% is standard)
A measure of the reliability of a result. The confidence level indicates the percent of time that the true percentage of the population would lie within a given margin of error (95% would be entered as 95 not .95).
Margin of Error
(i.e. ±3%)
The Margin of Error or Confidence Interval is the +/- number commonly reported in newspapers. It measures "how far off" your results might be at a given confidence level (3% would be entered as 3 not .03).
The size of the population you are projecting to (leave blank if it is unknown).
Size Needed


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