Sample Size Calculator
Select your test type, effect size, significance level, and desired power.
Statistical Test
Independent Samples T-Test
Paired Samples T-Test
One-Sample T-Test
One-Way ANOVA
Correlation
Chi-Square (2×2)
Two-Proportion Test
Effect Size (Cohen's d)
Small (0.2)
Medium (0.5)
Large (0.8)
Significance Level (α)
0.01
0.05
0.10
Target Power (1-β)
0.70
0.80
0.90
0.95
Calculate
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