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  Effect Size Calculator for Student's t-Test

This calculator will tell you the (two-tailed) effect size for Student's t-test (Cohen's d), given the mean and standard deviation for two independent samples of equal size.

By convention, t-test effect size values of 0.2, 0.5, and 0.8 are considered small, medium, and large, respectively.

Please supply the necessary parameters, and then click the 'Calculate' button.

Mean (Group 1):
Standard Deviation (Group 1):
Mean (Group 2):
Standard Deviation (Group 2):

 
 
 
 
The Statistics Calculators index now contains 56 free statistics calculators.

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