Cohen's d Effect Size Calculator
Discover the magnitude of difference between two group means with this intuitive calculator.
Input Parameters
Enter the means of your two samples and their pooled standard deviation to calculate Cohen's d.
Cohen's d Effect Size:
Distribution Visualization
Visual representation of the two groups' distributions and their overlap, illustrating the effect size.
Understanding Cohen's d Effect Size
Cohen's d measures the effect size, indicating the standardized difference between two means. It's calculated as the difference between the means divided by the pooled standard deviation.
A Cohen's d of 0.2 is considered a small effect, 0.5 a medium effect, and 0.8 a large effect. It helps to understand the practical significance of the difference between group means beyond statistical significance.
This calculator is useful in various fields like psychology, education, and healthcare to quantify the impact of interventions or compare different groups.