Turnover rate is a measure of how often people leave their jobs. It helps companies and organizations measure how easily they can find people who can do the job and how often they need to replace people who leave. To calculate the turnover rate, you divide the number of people who left their jobs by the total number of employees. For example, if a company has ten people start the job, and two people leave at the end of the month, the turnover rate is 20%.