Cohen’s d Effect Size Calculator
Group 1 (Control)
Group 2 (Treatment)
What is Cohen’s d Effect Size?
Cohen’s d is a standardized measure of effect size used to indicate the standardized difference between two means. It’s particularly useful in meta-analysis and statistical power analysis. The measure tells us how many standard deviations separate two means, making it an essential tool for understanding the practical significance of research findings in behavioral and social sciences.
How to Use Cohen’s d Effect Size Calculator
Step 1: Enter the mean value for your control group (Group 1) in the first input field.
Step 2: Input the standard deviation for Group 1 in the corresponding field.
Step 3: Enter the sample size for Group 1.
Step 4: Fill in the mean value for your treatment group (Group 2).
Step 5: Input the standard deviation for Group 2.
Step 6: Enter the sample size for Group 2.
Step 7: Click the calculate button to obtain your results.
Step 8: Review the calculated values for Cohen’s d, Glass’s Δ, and Hedges’ g, along with the detailed calculation explanation provided below the results.
Step 9: Interpret your results using these general guidelines: • 0.2: Small effect • 0.5: Medium effect • 0.8: Large effect