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📊 Sample Size Calculator
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Survey Parameters
Population Size
How many people are in the total group you are studying? (Leave empty for unknown/large)
Confidence Level
How confident do you want to be that the sample reflects the population? (Standard is 95%)
90%
95%
99%
Margin of Error (Confidence Interval)
The acceptable range of error (Standard is 5%).
%
Estimated Proportion
Expected variance. Leave at 50% for maximum safe sample size.
%
Required Sample Size
385
responses needed
Calculation Formula (Cochran's):
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Methodology Sentence
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