Cohen's d

Cohen's D is a measure of Effect Size required for the reporting of both the independent t-test and paired t-test.

Formula
$$d = \frac{\bar{x}_1 - \bar{x}_2}{SD}$$

Calculation
It can be calculated as follows:

Say, for example, an independent t-test has been conducted between males and females carrying out a test.

$$d = \frac{\bar{x}_1 - \bar{x}_2}{SD}$$

$$d = \frac{56 - 46}{16}$$

$$d = \frac{10}{16}$$

$$d = .625$$