Sample Size Calculator

Select Calculation Mode

Use 50% if not sure

Leave blank if unlimited population size

Statistical Visualization

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Calculation Tips

  • Use 50% population proportion if unsure - gives maximum sample size
  • 95% confidence level is standard for most research
  • Leave population size blank for large/infinite populations
  • Smaller margin of error requires larger sample size

About Sample Size

Sample size determination is crucial in statistics to ensure results are statistically significant. The calculator uses the standard formula considering confidence level, margin of error, and population parameters to provide accurate sample size estimates for surveys and experiments.

Note: Calculations assume normal distribution and use z-scores for confidence intervals.