Sample Size Calculator
Determine the required sample size for surveys and statistical studies.
Survey Parameters
How confident you want to be that the results are accurate
%
The acceptable range of error (typically 3-5%)
Total population size (leave empty if unknown or very large)
%
Expected % of sample with the attribute (use 50% if unknown)
About Sample Size
Sample size determines how many responses you need for statistically valid survey results.
Key Factors:
- Higher confidence = larger sample needed
- Smaller margin of error = larger sample needed
- Finite population reduces sample size needed
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Sample Size Result
n = (Z² × p × (1-p)) / E²
Required Sample Size385
Ad Space
970×90