Enter the number of employees from the starting group who are still employed at the end of the time period and the number of employees from that same starting group who 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 Calculator

Enter any 2 values to calculate the missing variable

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Employee Stability Index Formula

The following formula is used to calculate the Employee Stability Index (ESI) for a defined starting group of employees over a time period.

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

Variables:

  • ESI is the Employee Stability Index (%)
  • NT is the number of employees from the starting group who are still employed at the end of the time period
  • NTQ is the number of employees from the starting group who quit during the time period

To calculate the Employee Stability Index, divide the number of employees from the starting group still employed at the end of the time period (NT) by the total number of employees in that starting group (NT + NTQ). Multiply the result by 100 to get the Employee Stability Index as a percentage.

What is an Employee Stability Index?

The Employee Stability Index is a metric used by organizations to measure how well they retain a defined group of employees over a given time period (for example, employees who were employed at the start of a year and are still employed at the end of the year). A high stability index means a larger share of that starting group stayed, while a low stability index means more of that starting group left during the period. Because it focuses on a starting group, it does not directly reflect changes in total headcount caused by hiring during the period.

How to Calculate Employee Stability Index?

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

  1. First, identify a starting group of employees at the beginning of the time period.
  2. Next, determine how many employees from that starting group are still employed at the end of the time period (NT).
  3. Next, determine how many employees from that starting group quit during the time period (NTQ).
  4. Next, gather the formula from above = ESI = (NT / (NT + NTQ)) * 100.
  5. Finally, calculate the Employee Stability Index.
  6. 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 from the starting group still employed at the end of the time period (NT) = 150

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