Year-to-date, or YTD, turnover, measures the percentage of a company's workforce that has been replaced so far in the year. Because you need the company's employee records to determine the YTD turnover, you need access to those files, which may not be available to people outside the company. As a company manager, minimizing turnover is important because each new employee requires additional costs for training. The YTD turnover is a running total, meaning that it will change as the year goes on.

Add the number of employees at the start of the year to the number of new hires made so far during the year. For example, if the company started with 25 workers and added five new workers, you would add 25 plus 5 to get 30.

Divide the number of employees who left the company for any reason, such as termination or retirement, by the step 1 result. Here, if three employees had left, you would divide 3 by 30 to get 0.1.

Multiply the step 2 result by 100 to find the YTD turnover expressed as a percent. Here, you would multiply 0.1 by 100 to find the YTD turnover would be 10 percent.