Enter the number of employees that stayed during the period and the total number of employees at the start of the period into the Retention Rate Calculator. The calculator will evaluate the Retention Rate. 

Retention Rate Calculator

Enter any 2 values to calculate the missing variable

Related Calculators

Retention Rate Guide

Retention rate measures the percentage of employees from the beginning of a period who are still employed at the end of that same period. This calculator is employee-focused, but the same math also works for customers, students, members, or subscribers as long as you track the same starting group throughout the full period.

Retention Rate Formula

RTR = \frac{ES}{TE}\times 100
Variable Meaning
RTR Retention rate as a percentage
ES Employees who stayed through the full period
TE Total employees at the start of the period

Use a clearly defined time window such as one month, one quarter, or one year. For clean comparisons, keep the period length and counting rules consistent every time.

Rearranged Forms

If you know any two values, you can solve for the third:

ES = TE \times \frac{RTR}{100}
TE = \frac{ES}{RTR/100}

How to Calculate Retention Rate

  1. Choose the period you want to measure.
  2. Count how many employees were on staff at the start of that period.
  3. Count how many of that same starting group were still employed at the end.
  4. Enter the values into the calculator to find the retention rate.

What to Count

Employee Group Include in TE? Include in ES? Notes
Employees on staff at the start of the period Yes Yes, if still employed at the end This is the original group being tracked.
New hires during the period No No They were not part of the starting group.
Employees who left during the period Yes No They began in the group but did not remain through the end.
Internal transfers Usually yes Usually yes Apply a consistent rule based on your reporting scope.
Employees on leave Depends Depends Use the same HR policy definition every period.
Contractors or temporary workers Depends Depends Only include them if your workforce definition includes them at both dates.

Quick Validation Checks

  • TE should be greater than 0.
  • ES should be 0 or more.
  • ES should not exceed TE when you are tracking the original starting group.
  • The result will normally fall between 0% and 100%.

Examples

Example 1: A company starts the quarter with 60 employees, and 48 of those same employees are still employed at the end.

RTR = \frac{48}{60}\times 100 = 80\%

Example 2: A department starts with 150 employees and has a retention rate of 92%. Find how many stayed.

ES = 150 \times \frac{92}{100} = 138

Example 3: A team retained 171 employees and reported a 95% retention rate. Find the starting headcount.

TE = \frac{171}{95/100} = 180

How to Interpret the Result

Result Interpretation
100% Every employee in the starting group remained through the end of the period.
Less than 100% Some portion of the starting group left before the period ended.
Higher than prior periods Retention improved for the same type of employee group and timeframe.
Lower than prior periods Retention weakened and may justify a closer review by role, location, manager, or tenure band.

Common Mistakes

Mistake Why It Causes Problems
Counting new hires in the numerator Retention tracks the original starting group, not replacement hiring.
Using average headcount instead of starting headcount That changes the definition and makes comparison less consistent.
Comparing different period lengths directly A monthly rate and annual rate are not directly equivalent.
Changing who is included each period Inconsistent rules distort the trend.
Confusing retention with turnover Retention measures who stayed from the starting group; turnover measures departures and may use a different denominator.

For the most useful reporting, calculate retention the same way each time, compare like-for-like periods, and segment results by team, location, or tenure when you want to identify where improvement is needed most.