Effect Size Calculator
Result
Effect Size Calculator (Cohen's d) Effect Size Calculator (Cohen's d) is a mathematics calculator that helps you calculate effect size calculator (cohen's d) values from your input data. The formula used is: d = (μ₁−μ₂) / s_pooled · s_pooled = √[((n₁−1)s₁ — free online calculator.
Formula
- Effect Size Calculator calculates its result from N1, S1, N2, S2. It uses the formula d = (μ₁−μ₂) / s_pooled · s_pooled = √[((n₁−1)s₁²+(n₂−1)s₂²)/(n₁+n₂−2)]. Change any input to recalculate the result instantly.
- The main inputs are N1, S1, N2, S2. Enter them in the units and format shown in the calculator.
- Keep comparable quantities in compatible units whenever the formula combines or compares them.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Effect Size
- N1: 2
- S1: 3
- N2: 4
- S2: 5
Using N1 = 2, S1 = 3, N2 = 4, S2 = 5, the calculated result is 4.582575695.
Sample result: Calculating…
Frequently asked questions
What does the Effect Size calculate?
Effect Size Calculator (Cohen's d) Effect Size Calculator (Cohen's d) is a mathematics calculator that helps you calculate effect size calculator (cohen's d) values from your input data. The formula used is: d = (μ₁−μ₂) / s_pooled · s_pooled = √[((n₁−1)s₁ — free online calculator.
Which values should I enter?
Enter N1, S1, N2, S2 using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: d = (μ₁−μ₂) / s_pooled · s_pooled = √[((n₁−1)s₁²+(n₂−1)s₂²)/(n₁+n₂−2)].
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.