Enter the number of employees at the end of the time period and the number of employees that quit during the time period into the calculator to determine the Employee Stability Index. This calculator can also evaluate any of the variables given the others are known.

Employee Stability Index Formula

The following formula is used to calculate the Employee Stability Index (ESI). 

ESI = (NT / (NT + NTQ)) * 100

Variables:

  • ESI is the Employee Stability Index (%)
  • NT is the number of employees at the end of the time period
  • NTQ is the number of employees that quit during the time period

To calculate the Employee Stability Index, divide the number of employees at the end of the time period by the sum of the number of employees at the end of the time period and the number of employees that quit during the time period. Multiply the result by 100 to get the Employee Stability Index in percentage.

What is an Employee Stability Index?

The Employee Stability Index is a metric used by organizations to measure the retention rate of their employees. It provides insights into the effectiveness of the company’s human resource strategies, particularly those related to employee satisfaction, engagement, and loyalty. A high stability index indicates a low turnover rate, suggesting that employees are satisfied and likely to stay with the company for a longer period. Conversely, a low stability index suggests a high turnover rate, indicating potential issues with employee satisfaction or engagement.

How to Calculate Employee Stability Index?

The following steps outline how to calculate the Employee Stability Index (ESI).

  1. First, determine the number of employees at the end of the time period (NT).
  2. Next, determine the number of employees that quit during the time period (NTQ).
  3. Next, gather the formula from above = ESI = (NT / (NT + NTQ)) * 100.
  4. Finally, calculate the Employee Stability Index.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Number of employees at the end of the time period (NT) = 150

Number of employees that quit during the time period (NTQ) = 20