Sample Size Calculator
Calculate required sample sizes for surveys, experiments, and research studies
Instructions
1.Select calculation type (Mean, Proportion, or Group Comparison)
2.Enter the required parameters for your study
3.Specify confidence level or power requirements
4.Click “Calculate Sample Size” to get results
Effect Sizes
Small: d = 0.2
Medium: d = 0.5
Large: d = 0.8
Tips
• Use p = 0.5 for proportions when you want the maximum sample size
• 80% power is the standard minimum for most studies
• Consider adding 10-20% to account for dropouts
• Larger effect sizes require smaller sample sizes