Target Sample Size Calculator
Estimate how many responses are needed to achieve a desired margin of error in a survey.
CalcSimpler Examples
- Population 1,000, z 1.96, margin 5% ⇒ 277.54 people
- Population 5,000, z 2.58, margin 3% ⇒ 1349.83 people
FAQ
Why assume a 50% proportion?
It yields the maximum required sample size.
What is a z-score?
A z-score corresponds to the desired confidence level.
Does the formula handle small populations?
Yes, it uses a finite population correction.
Additional Information
- Common z-scores: 1.645 (90%), 1.96 (95%), 2.576 (99%).
- Results are rounded to show fractional participants for clarity.
CalcSimpler