How to interpret Cohen's d?
d < 0.2: negligible, 0.2-0.5: small, 0.5-0.8: medium, > 0.8: large effect size
Calculator
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Results
Cohen\'s d
0.667
Medium effect
Analysis
Interpretation of the current calculator output
Calculation Summary
The current inputs have been processed for the cohen's d calculator. Review the results panel for the computed output and use the charts tab to compare the current values visually.
How to Read It
The main result shows the direct answer for your current inputs. Supporting sections below explain the method, example, and common questions so the result is easier to interpret.
How to Use
Step-by-step instructions
- 1Enter means of both groups.
- 2Enter standard deviations.
- 3View effect size and interpretation.
Cohen's d
Measures the standardized difference between two means.
d = (M₂ - M₁) / SD_pooledVariables:
MMeanSDStandard deviationExample
Test Scores
Inputs:
Group 1:100 (SD 15)
Group 2:110 (SD 15)
Steps:
- 1.SD_pooled = √((15² + 15²) / 2) = 15
- 2.d = (110 - 100) / 15 = 0.67
Result:
0.67 (medium)