What you provide
What you provide
- First sample mean, using the same scenario as the other inputs
- Second sample mean, using the same scenario as the other inputs
- Pooled standard deviation, using the same scenario as the other inputs
MATH / EFFECT SIZE
Cohen D Effect Size Calculator
Standardize the difference between two sample means using a supplied pooled standard deviation. Inspect the equation, substituted values, result, and interpretation limits in one guided workspace.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
Standardize the difference between two sample means using a supplied pooled standard deviation. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.
Calculation path
d=(x1-x2)/s_p
What you receive
What you receive
- Cohen d from the stated equation
- A symbolic formula plus substituted working with your values
- Visible assumptions, field guidance, and an authoritative learning reference
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
Interpret the result only when sampling, independence, measurement, and distribution assumptions fit the data.
Use internally consistent units and retain extra precision when carrying the result into another calculation.
Reviewed reference factors