Absence Rates Retention Formula
Learn how employee retention, absence rate, available working days and estimated absence cost are calculated.
This calculator uses opening headcount to estimate the proportion of starting employees retained, the share of scheduled working time lost to absence, and the direct cost of those lost days. Using the same definitions and reporting period each time makes trend comparisons more meaningful.
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Employee Absence Rate
Where:
Divide total recorded absence days by all scheduled workdays available to the opening workforce, then multiply by 100.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| startingEmployees - Employees at start of period | Number of employees employed when the reporting period begins. | employees |
| leavers - Employees who left | Number of opening employees who permanently left during the period. | employees |
| workingDaysPerEmployee - Working days per employee | Scheduled workdays for one full-time equivalent employee in the reporting period. | days |
| absenceDays - Total absence days | Total recorded workdays lost to the absence categories being tracked. | days |
| costPerAbsenceDay - Estimated cost per absence day | Estimated direct cost assigned to each lost workday. | currency |
Step-by-Step Calculation
Calculate employees retained
Subtract employees who left from the opening headcount.
retainedEmployees = startingEmployees - leavers
Calculate the retention rate
Express retained opening employees as a percentage of the opening workforce.
retentionRate = (retainedEmployees / startingEmployees) * 100
Calculate available working days
Multiply opening headcount by scheduled days per employee.
availableWorkingDays = startingEmployees * workingDaysPerEmployee
Calculate the absence rate
Express lost absence days as a percentage of scheduled available days.
absenceRate = (absenceDays / availableWorkingDays) * 100
Calculate estimated absence cost
Multiply recorded absence days by the estimated daily cost.
estimatedAbsenceCost = absenceDays * costPerAbsenceDay
Annual absence and retention calculation
Employees retained
100 - 8
92 employees
Retention rate
(92 / 100) * 100
92.0%
Available working days
100 * 260
26,000 days
Absence rate
(450 / 26000) * 100
1.73%
Estimated absence cost
450 * 180
$81,000
Final Result
Estimated retention is 92.0%, absence rate is 1.7%, and direct absence cost is $81,000.
Assumptions
- ✓Retention includes only employees present at the start of the reporting period.
- ✓The opening headcount is used as the available-workday base.
- ✓Working days per employee reflect the same reporting period as the absence data.
- ✓Absence days are recorded consistently across the workforce.
- ✓The daily cost is an estimate of direct cost per lost day.
Limitations
- !New hires, changes in headcount, and different part-time schedules are not reflected in the simple opening-headcount denominator.
- !The estimate does not automatically include indirect costs such as delayed work, overtime premiums, training, or management time.
- !A percentage alone does not explain the reasons, duration, or distribution of absence.
- !Retention does not measure whether leavers were replaced or whether the total workforce grew or shrank.
Common Mistakes to Avoid
Using calendar days instead of scheduled working days per employee.
Including planned annual leave in one period but excluding it in another.
Counting new hires as retained employees from the opening workforce.
Using absence days and working days from different reporting periods.
Comparing costs when the daily-cost assumption has changed.
Entering leavers greater than the opening headcount.
Related Formulas
Frequently Asked Questions
What is the formula for employee absence rate?
Absence rate equals total absence days divided by available working days, multiplied by 100. Available working days are opening employees multiplied by working days per employee.
How is employee retention calculated?
Employees retained equal opening employees minus leavers. The retention rate is retained employees divided by opening employees, multiplied by 100.
How do you calculate the cost of employee absence?
Multiply total recorded absence days by an estimated cost per absence day.
Are new hires included in this retention formula?
No. This measure tracks how many employees from the opening workforce remained during the period.
Can the formula be used for monthly reporting?
Yes. Use the opening headcount, scheduled days, absence days, and leavers that all relate to the same month.
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