Cohen's d Calculator
Compute Cohen's d effect size from two groups.
Input Data
Input Group1 mean x̄₁.
Input Group2 mean x̄₂.
Input Group1 SD s₁.
Input Group1 n₁.
Input Group2 SD s₂.
Input Group2 n₂.
Results
0.883452
d = (x̄₁−x̄₂) / pooled SD.
At a glance:Cohen's d Calculator: enter parameters to compute results; complements related calculators.
Formula
sp = √(((n₁−1)s₁² + (n₂−1)s₂²)/(n₁+n₂−2)).
d = (x̄₁−x̄₂) / sp.
How to Use
- Enter both groups' means, SD and sizes.
- It returns Cohen's d.
Case Studies
x̄₁=10,x̄₂=8,… → d≈0.7356
pooled sp ≈ 2.7190, d = 2/2.7190 ≈ 0.7356.
FAQ
How to interpret d?
Roughly |d|≈0.2 small, 0.5 medium, 0.8 large (field-dependent).
Related Tools
References
Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.