What absenteeism and turnover rates measure
The absenteeism rate is the share of scheduled hours that employees did not work because of absence. The turnover rate is the share of the workforce that joins and leaves in a period. Together they show how much planned capacity is lost before it reaches the workstation.
Absenteeism is a short-term problem: the line starts the shift short-handed and takt time cannot be met. Turnover is a medium-term problem: the line loses people who know the job, and a new hire needs months to reach standard time. Both feed into manpower sizing, which needs a buffer to cover absences.
Visual map of absenteeism and turnover
The map brings together the formulas, the 120-person plant example, the cost of turnover and the limits of each metric.
How to calculate the absenteeism rate
Absenteeism rate (%) = hours absent ÷ scheduled hours × 100
Scheduled hours are headcount × working days × daily shift length. Write down in a policy what counts as absence: unplanned absences, late arrivals, sick notes and short leaves count; vacation and planned days off stay out of the base. Without that rule each department measures differently and comparisons are meaningless.
Example (fictional): a plant with 120 employees, 22 working days in the month and an 8-hour shift. Scheduled hours: 120 × 22 × 8 = 21,120 h. Absences totaled 1,056 h.
Absenteeism rate = 1,056 ÷ 21,120 × 100 = 5.0%
| Reason | Hours | % of absences | Contribution to rate |
|---|---|---|---|
| Medical certificates | 640 | 60.6% | 3.03 pp |
| Unexcused absences | 216 | 20.5% | 1.02 pp |
| Appointments, family and other | 200 | 18.9% | 0.95 pp |
| Total | 1,056 | 100% | 5.00 pp |
The 1,056 hours equal 132 person-days (1,056 ÷ 8), or 6 people absent for the whole month (132 ÷ 22). At an average cost of $30 per hour (wages plus benefits, an example value), the figure is 1,056 × 30 = $31,680 per month, before counting cover overtime and lost output.
How to calculate the turnover rate
Average headcount is the mean of headcount at the start and at the end of the period. Two formulas are in use; pick one and keep it:
Turnover rate (%) = [(hires + separations) ÷ 2] ÷ average headcount × 100
Separation rate (%) = separations ÷ average headcount × 100
The first treats hires and separations as half each. It has a flaw: if the company is growing and hiring heavily, the rate rises even though nobody left. For that reason many plants use separations only, which measures the loss of people. In the US the second version is the usual one (separations divided by average employment).
Example (fictional), full year: opening headcount 118, closing 122, with 22 hires and 18 separations (118 + 22 − 18 = 122). Of the 18, 12 were resignations and 5 happened within the first 90 days.
| Metric | Calculation | Result |
|---|---|---|
| Average headcount | (118 + 122) ÷ 2 | 120 |
| Total turnover | [(22 + 18) ÷ 2] ÷ 120 | 16.7% |
| Separation rate | 18 ÷ 120 | 15.0% |
| Voluntary turnover | 12 ÷ 120 | 10.0% |
| Early turnover (within 90 days) | 5 ÷ 18 | 27.8% of separations |
The early figure demands the most attention: almost three in ten exits happen before the employee settles in. That usually points to a weakness in selection, onboarding or initial training.
What turnover costs
Every exit creates a replacement cost. The values below are assumptions for the example; use your own payroll and HR data.
| Cost item per separation | Amount ($) |
|---|---|
| Recruiting and selection | 1,500 |
| Onboarding and training | 2,500 |
| Severance and administrative costs | 3,200 |
| Productivity lost until the new hire reaches standard | 3,800 |
| Total per exit | 11,000 |
With 18 separations: 18 × 11,000 = $198,000 per year. Absenteeism at 5.0% costs $31,680 per month, or $380,160 per year if the level holds. Comparing the two helps decide where to act first, but turnover cost is usually underestimated because lost productivity rarely shows up in the accounts.
How to read the rates and act
- Break the data down by department, shift, supervisor and tenure. The plant average hides the station where the problem sits. Run a Pareto chart on absence reasons.
- Compare with your own history and with similar sites. Do not adopt an "industry average" without a reliable source.
- Spot repeated short absences with the Bradford factor: S² × D, where S is the number of spells and D the total days. A person with 3 spells totaling 6 days scores 3² × 6 = 54; one with a single 6-day spell scores 1² × 6 = 6. The factor shows a pattern, not guilt.
- Attack physical causes: strain and posture produce sick leave. See ergonomics in production and the risk management in ISO 45001.
- Cut early exits: structured onboarding, on-the-job training and a skills matrix, using a method such as TWI.
- Work on leadership: many resignations are tied to the relationship with the supervisor. See Lean leadership. In exit interviews, apply the 5 Whys.
- Make the number visible on the visual management board, with a target and monthly trend.
Common mistakes
- Mixing bases: dividing absent hours by headcount instead of scheduled hours, or comparing a 20-day month with a 23-day month without using the rate.
- Counting vacation as absence (or forgetting late arrivals) without writing the rule down.
- Changing the turnover formula mid-series: the rate moves although nothing changed in reality.
- Looking only at the average: a 5% rate can be 1% in most departments and 15% on one shift.
- Using the rate to punish. Absence is a symptom; treating the data as discipline hides the reasons and degrades the records.
- Ignoring hidden cost: supervisors' time spent training and product quality in the new hire's first weeks.
Frequently asked questions
What is the absenteeism rate formula?
Absenteeism rate (%) = hours absent ÷ scheduled hours × 100. Scheduled hours = headcount × working days × daily shift length.
What is the employee turnover formula?
Turnover (%) = [(hires + separations) ÷ 2] ÷ average headcount × 100. Many companies use only separations in the numerator.
Does vacation count as absence?
Usually not: vacation and planned days off stay out of the base. What matters is to write the rule in policy and apply it equally in every department.
What is an acceptable absenteeism rate?
There is no universal figure. Compare with your own history, your sector and your shift, and set a gradual reduction target. In the example, 5.0% equals 6 people absent all month.
What is the difference between voluntary and involuntary turnover?
Voluntary means the employee chose to leave (resignation); involuntary means the company ended the employment. In the example, 12 of the 18 separations were voluntary.
How can early turnover be reduced?
Improve selection, structure onboarding and on-the-job training, and follow the new hire closely during the first 90 days. Exit interviews reveal the real causes.
Sources
- BOHLANDER, G.; SNELL, S. Managing Human Resources. Cengage Learning.
- DESSLER, G. Human Resource Management. Pearson.
- CHIAVENATO, I. Gestão de Pessoas. Barueri: Manole.
Keep studying: trusted sources and links
- ABEPRO: Associação Brasileira de Engenharia de Produção (in Portuguese)
- Wikipedia: Lean manufacturing
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About the author
Lean Manufacturing & Behavioral Management Specialist
Over 20 years in the automotive and metalworking industries (GM and Dana), Lean Manufacturing practitioner since 2006. SENAI instructor and mentor in Brazil’s Brasil Mais Produtivo program, delivering consulting, training and audits for 50+ companies, combining quality, productivity and people development.
