What is the best HR-to-employee ratio, and why To help businesses figure out best practices for HR-to-employee ratios, we asked business leaders and HR experts their thoughts on this question. From 2.5 per 100 employees to the best ratio varying, there are several HR-to-employee ratios that may help your business thrive. Here are eight HR-to-employee ratios:   2.5 to 100 There is no Perfect HR-to-employee Ratio 1 to 15 1