What components are the key costs associated with Employee turnover. Of course I have the basics looking for a tool (i.e.template, EXCEL?) to capture and compute all associated costs to get a per person cost of turnover. Is there a standard per hire

What components are the key costs associated with Employee turnover. Of course I have the basics looking for a tool (i.e.template, EXCEL?) to capture and compute all associated costs to get a per person cost of turnover. Is there a standard per hire ratio base on ee salary an employer can use as a basis? To one more is there a standard based on Government Technical jobs?