Individual Absence Rate Formula
Learn how to calculate an individual's absence rate and attendance rate from scheduled working days and days absent.
An individual absence rate shows the proportion of scheduled working days missed during the same reporting period. It provides a consistent percentage for reviewing absence over a week, month, year, or custom period when the underlying day counts use the same definitions.
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Individual Absence Rate
Where:
Divide the days absent by the days the individual was scheduled to work, then multiply by 100 to express the result as a percentage.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| absenceDays - Days absent | The total scheduled workdays or part-days missed through absence in the selected period. | days |
| scheduledWorkDays - Scheduled working days | The workdays the individual was expected to work during the same period, excluding days they were not scheduled to work. | days |
| daysWorked - Estimated days worked | Scheduled working days remaining after absence days are subtracted. | days |
| attendanceRate - Attendance rate | The percentage of scheduled working days not lost to recorded absence. | percent |
Step-by-Step Calculation
Use one matching measurement period
Record scheduled working days and absence days for the same week, month, quarter, year, or custom period.
period = period
Calculate estimated days worked
Subtract absence days from scheduled working days. The maximum function prevents estimated days worked from falling below zero.
daysWorked = max(scheduledWorkDays - absenceDays, 0)
Calculate the absence proportion
This gives the share of scheduled work time that was missed.
absenceDays / scheduledWorkDays
Convert the proportion to a percentage
Multiplying by 100 expresses the absence proportion as a percentage.
absenceRate = (absenceDays / scheduledWorkDays) * 100
Calculate the attendance rate
Divide estimated days worked by scheduled working days to find the complementary attendance percentage.
attendanceRate = (daysWorked / scheduledWorkDays) * 100
Annual absence rate calculation
Subtract absence from scheduled days
220 - 8
212 days worked
Find the absence proportion
8 / 220
0.03636
Convert to an absence percentage
0.03636 * 100
3.64%
Calculate attendance rate
212 / 220 * 100
96.36%
Final Result
The individual absence rate is 3.64%, based on 8 absent days out of 220 scheduled working days. Estimated attendance is 96.36%.
Assumptions
- ✓Scheduled working days and absence days cover exactly the same measurement period.
- ✓Absence is recorded as scheduled workdays, and part-day absences may be entered as decimals.
- ✓Non-working days, such as weekends, contractual days off, and days not scheduled for work, are excluded from scheduled working days.
- ✓The calculation treats every scheduled workday equally and does not weight days by hours, shifts, or pay.
- ✓Attendance rate is calculated from the same scheduled-day total as absence rate.
Limitations
- !The percentage does not show the reason, duration pattern, or timing of absences.
- !A day-based result may not reflect differences in shift length or contracted hours.
- !Different organisations may classify annual leave, appointments, training, family leave, or other time away differently.
- !A short reporting period can produce a large percentage change from a single absence day.
- !The result is an estimate for recordkeeping and should be interpreted alongside relevant circumstances and applicable workplace rules.
Common Mistakes to Avoid
Using calendar days rather than days the individual was actually scheduled to work.
Combining absence days from one period with scheduled days from another period.
Including weekends or regular non-working days in the scheduled working-day total.
Entering a half-day absence as a full day instead of 0.5 days.
Counting approved annual leave as absence without checking the definitions used for the report.
Comparing percentages across individuals whose schedules or reporting periods are substantially different.
Related Formulas
Frequently Asked Questions
What is the formula for an individual absence rate?
Divide days absent by scheduled working days for the same period, then multiply by 100.
How do I calculate an absence rate from 8 days absent out of 220 days?
Calculate 8 ÷ 220 × 100, which equals 3.64% when rounded to two decimal places.
Can an individual absence rate use half-days?
Yes. Enter equivalent workdays as decimals, such as 0.5 for a half-day, as long as the scheduled total is measured on the same basis.
How is attendance rate calculated?
Subtract absence days from scheduled working days, divide the result by scheduled working days, and multiply by 100.
Does attendance rate always equal 100% minus absence rate?
Yes in this calculation, provided both rates use the same scheduled working days and absence is the only deducted time category.
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