Frequent or habitual absence from work without valid reason.
Absenteeism refers to the habitual pattern of an employee being absent from work without a legitimate reason. It is measured as the absenteeism rate — the percentage of scheduled working time lost to unplanned absence. High absenteeism affects productivity, team morale and cost, but the raw rate is a blunt instrument: it treats one long, well-documented illness and ten scattered single days as the same problem, when they need entirely different responses.
The standard measure is lost time as a share of scheduled time. Count only unplanned absence — approved annual leave is not absenteeism, and folding it in makes generous holiday allowances look like an attendance problem.
Absence rate % = (days lost to unplanned absence ÷ total scheduled working days) × 100
The Bradford Factor is a widely used index built on the observation that short, frequent, unpredictable absences disrupt a team far more than a single long one. It weights the number of separate absence instances heavily by squaring it, then multiplies by total days lost.
Take three employees who each lose ten days in a year. One absence of ten days scores 1² × 10 = 10. Five absences of two days score 5² × 10 = 250. Ten single days score 10² × 10 = 1,000 — a hundred times the first, on identical days lost. That spread is the point: it surfaces the pattern that rosters and cover arrangements actually struggle with.
Use it as a trigger for a conversation, never as an automatic disciplinary threshold. The index cannot distinguish a disability, a chronic condition or a caring responsibility from casual absence, and applying a fixed score mechanically is a well-worn route to a discrimination claim. Most organisations that use it well pair each trigger with a return-to-work discussion and an explicit exemption process.
Bradford Factor = S² × D, where S is the number of separate absence instances and D is the total days lost.
The direct cost is straightforward: sick pay and any cover or overtime. The indirect cost is larger and rarely counted — lost output, deadlines absorbed by colleagues, the management time spent rearranging work, and the slow erosion of morale in a team that repeatedly covers for the same gap. Because only the direct half is visible in payroll, absenteeism is routinely under-priced in budget discussions.
Aggregate absence data is most useful segmented. Absence clustered in one team under one manager is a management signal, not a health signal. Absence concentrated on Mondays and Fridays suggests something different again from absence spread evenly. Absence rising in a specific shift pattern points at the roster. The rate tells you there is something to look at; only the segmentation tells you where.
No. Absenteeism measures unplanned, unscheduled absence. Approved annual leave is planned time off that the business has already accounted for, and including it makes the metric meaningless as a signal.
It should not be used as an automatic trigger for any sanction. It is a prioritisation tool that flags patterns worth a conversation, and it cannot distinguish disability-related or protected absence from casual absence. Score-driven action without an individual review is a recognised legal risk.
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