Individual Absence Rate Formula
Learn how to calculate an employee's absence rate, attendance rate, average absence duration, and annualised absence figures.
This calculator measures absence against the workdays an individual was scheduled to work in a review period. It helps put absence days, separate absence spells, and part-time working patterns into a consistent percentage and annualised estimate.
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Individual Absence Rate
Where:
Divide the scheduled workdays missed through absence by the scheduled workdays in the same period, then multiply by 100.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| absenceDays - Absence days | Total scheduled workdays missed through absence during the review period. | days |
| scheduledWorkDays - Scheduled workdays | Workdays the individual was expected to work in the review period. | days |
| absenceOccasions - Absence occasions | Number of separate recorded spells of absence in the review period. | number |
| annualScheduledWorkDays - Annual scheduled workdays | The individual's usual scheduled workdays in a full year. | days |
Step-by-Step Calculation
Record scheduled workdays
Use the days the person was scheduled to work in the review period, rather than calendar days.
scheduledWorkDays
Calculate the absence rate
This gives the percentage of scheduled workdays missed through absence.
(absenceDays / scheduledWorkDays) * 100
Calculate the attendance rate
Attendance is the proportion of scheduled workdays not missed through absence.
((scheduledWorkDays - absenceDays) / scheduledWorkDays) * 100
Calculate average absence duration
This shows the average number of absence days in each recorded absence occasion.
absenceDays / absenceOccasions
Annualise absence days
This projects the observed absence-day rate over the person's annual workday schedule.
(absenceDays / scheduledWorkDays) * annualScheduledWorkDays
Annualise absence occasions
This projects the observed frequency of separate absence spells over a full working year.
(absenceOccasions / scheduledWorkDays) * annualScheduledWorkDays
Example: six-month employee absence review
Calculate absence rate
(10 / 130) * 100
7.7%
Calculate attendance rate
((130 - 10) / 130) * 100
92.3%
Calculate average absence duration
10 / 3
3.3 days per occasion
Annualise absence days
(10 / 130) * 260
20.0 days per year
Annualise absence occasions
(3 / 130) * 260
6.0 occasions per year
Final Result
The individual absence rate is 7.7%, with an estimated 20.0 absence days and 6.0 absence occasions per year if the same pattern continues.
Assumptions
- ✓Absence days are scheduled workdays missed, not calendar days.
- ✓Scheduled workdays reflect the individual's actual working pattern, including part-time arrangements.
- ✓Each separate absence spell is counted as one occasion under the organisation's recording approach.
- ✓Annualised values assume the review period's pattern continues across the annual scheduled workdays.
Limitations
- !Annualised figures are projections and may be unrepresentative when the review period is short.
- !The calculation does not distinguish between absence reasons, length of service, seasonal effects, or approved leave categories.
- !Results depend on accurate absence records and a consistent definition of a separate absence occasion.
- !The figures are administrative measures and should not be the sole basis for employment or wellbeing decisions.
Common Mistakes to Avoid
Using calendar days instead of scheduled workdays.
Including annual leave, public holidays, or other non-working days in scheduled workdays when policy excludes them.
Using absence occasions from a different period than the absence-day total.
Entering a full-time annual schedule for a part-time employee.
Treating an annualised result as a guaranteed forecast rather than a projection.
Related Formulas
Frequently Asked Questions
What is the formula for an individual absence rate?
Absence rate equals absence days divided by scheduled workdays, multiplied by 100.
How is attendance rate calculated from absence?
Attendance rate equals scheduled workdays minus absence days, divided by scheduled workdays, multiplied by 100.
How do you calculate average absence duration?
Divide total absence days by the number of separate absence occasions in the same review period.
How are annualised absence days calculated?
Divide absence days by scheduled workdays, then multiply the result by the individual's annual scheduled workdays.
Can an absence rate be calculated for a part-time employee?
Yes. Use that employee's own scheduled workdays in the review period and their usual annual workday total.
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