Individual Absence Rate and Attendance Retention Formula
Learn how to calculate an individual's absence rate, attendance retention rate, retained working days and average absence days per month.
This calculation converts recorded absence days into percentages and retained working time for a defined reporting period. Using the same period for every input makes it easier to describe attendance records consistently without drawing conclusions about the reasons for absence.
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Individual Absence Rate
Where:
Divide all recorded absence days by the days the individual was scheduled to work, then multiply by 100 to express the time lost as a percentage.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| absenceDays - Total absence days | All recorded absence days included under the chosen reporting definition during the period. | days |
| scheduledDays - Scheduled working days | Days the individual was expected to work during the same reporting period. | days |
| retainedDays - Retained working days | Scheduled working days remaining after total absence days are deducted. | days |
| unplannedAbsenceDays - Unplanned absence days | Recorded absence days that were not planned in advance, such as sickness or emergency leave. | days |
| periodMonths - Period length | Number of months included in the attendance records. | months |
| averageHeadcount - Average team headcount | Number of people used for an optional per-person comparison; use 1 for an individual calculation. | number |
Step-by-Step Calculation
Set the reporting period
Use scheduled working days and absence records that cover the same period.
scheduledDays > 0
Calculate retained working days
Deduct total recorded absence days from scheduled working days. The maximum function prevents a negative retained-days result.
max(scheduledDays - absenceDays, 0)
Calculate the total absence rate
This shows the share of scheduled working time recorded as absent.
(absenceDays / scheduledDays) * 100
Calculate the attendance retention rate
This shows the share of scheduled working time retained after absences.
(retainedDays / scheduledDays) * 100
Calculate the unplanned absence rate
This separates unplanned absence as a percentage of all scheduled working days.
(unplannedAbsenceDays / scheduledDays) * 100
Calculate the monthly absence average
Spread total absence days across the months in the selected period.
absenceDays / periodMonths
Calculate absence days per person when needed
For an individual record, headcount is normally 1, so the result equals total absence days.
absenceDays / averageHeadcount
Example: annual individual attendance review
Retained working days
max(220 - 8, 0)
212 days
Total absence rate
(8 / 220) × 100
3.6%
Attendance retention rate
(212 / 220) × 100
96.4%
Unplanned absence rate
(5 / 220) × 100
2.3%
Average absence per month
8 / 12
0.7 days per month
Final Result
The absence rate is 3.6%, the attendance retention rate is 96.4%, and 212 of 220 scheduled working days were retained.
Assumptions
- ✓All inputs relate to the same reporting period.
- ✓Scheduled days exclude non-working days, such as weekends, public holidays, approved annual leave and days before employment began, unless a different reporting definition is used.
- ✓Absence days are recorded consistently and may include partial days as decimals.
- ✓Unplanned absence days are a subset of total absence days, not an additional total.
- ✓The average team headcount is 1 for a standard individual calculation.
Limitations
- !The results describe recorded time only and do not explain the circumstances, legitimacy or impact of an absence.
- !Different organisations may classify planned leave, appointments, family leave and other time away differently.
- !A percentage can look different across periods with different numbers of scheduled days.
- !The calculator does not assess performance, reliability, health, workload, disability-related needs or contribution while at work.
- !Results should not be used as the sole basis for employment decisions.
Common Mistakes to Avoid
Using calendar days rather than days the individual was actually scheduled to work.
Including approved annual leave in absence days when it has been excluded from the reporting definition.
Comparing absence days from one period with scheduled days from another period.
Entering unplanned absence days that are higher than total absence days.
Rounding half-day or other partial-day absences to whole days unnecessarily.
Treating an absence percentage as an explanation of an individual's attendance circumstances.
Related Formulas
Frequently Asked Questions
What is the formula for an individual absence rate?
Divide total absence days by scheduled working days for the same period and multiply by 100.
How is attendance retention calculated?
Subtract absence days from scheduled days, then divide the retained days by scheduled days and multiply by 100.
Is attendance retention always 100% minus the absence rate?
Yes, when both figures use the same scheduled days and total absence days, apart from small differences caused by rounding.
Can partial-day absences be included?
Yes. Enter decimals such as 0.5 for a half-day absence, provided the same method is used throughout the period.
How do I calculate average absence days per month?
Divide total absence days by the number of months in the reporting period.
What does the unplanned absence rate show?
It shows unplanned absence days as a percentage of scheduled working days. It should be treated as a subset of total absence, not an extra category added to it.
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