Effect Size Calculator

Calculate Cohen's d, Hedges' g, and interpret effect size magnitude.

Calculate effect size

Mean 1:

Mean 2:

SD 1:

SD 2:

About This Calculator

Calculate Cohen's d, Hedges' g, and interpret effect size magnitude.

FAQs

What is Cohen's d?

Standardized difference between two means.

How is effect size interpreted?

0.2=small, 0.5=medium, 0.8=large.