Individual Absence Rate Hours Formula
Learn how to calculate an individual employee's absence rate, attended hours, and attendance rate from working hours.
An individual absence rate shows what percentage of scheduled working time was recorded as absence during one matching measurement period. It makes absence totals comparable across different working patterns by relating missed hours to expected hours.
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Absence Rate
Where:
Divide the hours recorded as absence by the hours the person was scheduled to work, then multiply by 100.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| absenceHours - Absence hours | Qualifying hours recorded as absence during the measurement period. | hours |
| scheduledHours - Scheduled working hours | Hours the individual was expected to work during the same measurement period. | hours |
| attendedHours - Estimated attended hours | Scheduled hours remaining after absence hours are removed. | hours |
| absenceRate - Absence rate | The percentage of scheduled working time recorded as absence. | percent |
| attendanceRate - Attendance rate | The percentage of scheduled working time not recorded as absence. | percent |
Step-by-Step Calculation
Use one matching measurement period
Choose a period, such as four weeks, 13 weeks, six months, 12 months, or a custom date range, and ensure both hour totals cover it exactly.
measurementPeriod(absenceHours) = measurementPeriod(scheduledHours)
Calculate the absence rate
This expresses missed time as a percentage of expected working time.
absenceRate = (absenceHours / scheduledHours) * 100
Calculate estimated attended hours
Subtract recorded absence hours from the scheduled hours.
attendedHours = scheduledHours - absenceHours
Calculate the attendance rate
This expresses the scheduled time not recorded as absence as a percentage.
attendanceRate = (attendedHours / scheduledHours) * 100
Check the percentage relationship
When the same hours and period are used consistently, absence rate and attendance rate should add up to 100%.
absenceRate + attendanceRate = 100
Example: 12-month absence rate for one employee
Divide absence hours by scheduled hours
32 / 1950
0.0164103
Convert to an absence percentage
0.0164103 * 100
1.64%
Calculate attended hours
1950 - 32
1,918 hours
Calculate attendance rate
(1918 / 1950) * 100
98.36%
Check the totals
1.64% + 98.36%
100.00%
Final Result
For the 12-month period, the absence rate is 1.64%, estimated attended hours are 1,918 hours, and the attendance rate is 98.36%.
Assumptions
- ✓Scheduled hours and absence hours cover exactly the same measurement period.
- ✓Absence hours do not exceed scheduled hours for the period.
- ✓All entered absence hours are treated equally; the formula does not separate sickness, authorised leave, or other categories.
- ✓Leave, public holidays, overtime, rostered days off, and unpaid time are included or excluded consistently under the reporting approach being used.
- ✓Attended hours are estimated as scheduled hours less absence hours.
Limitations
- !The calculation does not determine whether a type of absence should be included in a workplace report.
- !Results can be misleading when scheduled hours and absence hours use different dates or different leave treatments.
- !The percentage does not show the reason, pattern, timing, or operational effect of absence.
- !Overtime and changes to contracted hours can affect comparisons if they are handled inconsistently.
- !A calculated absence rate is a record-keeping measure, not a basis by itself for employment, performance, or entitlement decisions.
Common Mistakes to Avoid
Using absence hours from one period with scheduled hours from another period.
Entering contracted annual hours instead of the actual hours scheduled in the chosen period.
Including annual leave or public holidays in one employee record but excluding them in another without a consistent reporting rule.
Counting overtime as scheduled time in some calculations but not others.
Comparing raw absence hours between full-time and part-time workers instead of comparing their percentage rates.
Failing to investigate a result above 100%, which usually indicates mismatched dates or incorrect inputs.
Related Formulas
Frequently Asked Questions
What is the formula for an individual absence rate in hours?
Absence rate equals absence hours divided by scheduled working hours, multiplied by 100.
How do I calculate attended hours from absence hours?
Subtract absence hours from scheduled working hours. This produces estimated attended hours for the selected period.
How is attendance rate calculated?
Divide estimated attended hours by scheduled working hours and multiply by 100. It is normally 100% minus the absence rate.
Do absence rate and attendance rate always total 100%?
They normally do when attended hours are calculated as scheduled hours minus absence hours and all figures cover the same period.
Can I use this formula for a part-time employee?
Yes. Use that individual's own scheduled hours and qualifying absence hours for the same period. The percentage adjusts for their working pattern.
Why are matching dates important in the absence-rate formula?
The denominator must represent the hours the individual was expected to work during the same dates as the recorded absence. Otherwise the percentage is not comparable.
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