The percentage of employees who leave a company over a given time period is referred to as the turnover rate. There are two different types of turnover. The first is voluntary turnover, which occurs when employees decide to depart. The second type is involuntary turnover, which occurs when a company fires an employee.

We divide the number of terminated employees within a given time by the number of employees at the start of that period to get the turnover rate. So, for example, if we start the year with 100 employees and 30 of them leave during the year, the turnover rate is 30/100 = 0.3, or 30%.

Turnover is not the same as attrition. Force reductions and terminations are not taken into account when assessing attrition.