Understanding the Bradford Factor
The Bradford Factor is a mathematical formula used by HR departments to measure the impact of employee absenteeism, particularly short-term unplanned absences. It was developed at Bradford University School of Management in the 1980s and is widely used across UK businesses.
The Bradford Factor's key insight is that frequent short absences cause disproportionately more operational disruption than equivalent days taken in a single long absence — because each separate absence episode requires reactive scheduling, coverage arrangement, and workflow interruption.
Bradford Factor Trigger Points
| Score Range | Risk Level | Typical HR Response |
|---|---|---|
| 0–24 | Low | No action required |
| 25–74 | Caution | Informal chat with manager |
| 75–199 | Warning | Formal absence review meeting |
| 200–399 | High Risk | Written warning, absence management plan |
| 400+ | Critical | Final warning, possible disciplinary action |
The Bradford Formula
Where:
- B = Bradford Factor score
- S = Number of separate absence spells in the rolling 52-week period
- D = Total days absent in the same period
Why Frequency Matters More Than Duration
| Scenario | Spells | Days | Bradford Score |
|---|---|---|---|
| One 12-day illness | 1 | 12 | 12 (low) |
| Four 3-day absences | 4 | 12 | 192 (high risk) |
| Twelve 1-day absences | 12 | 12 | 1,728 (critical) |
All three scenarios involve 12 lost days, but the operational impact and Bradford Score differ dramatically.
Legal and Ethical Considerations
The Bradford Factor should be used as one input in absence management decisions, not as the sole determinant. Courts in the UK have ruled against dismissals based purely on Bradford Scores without considering underlying medical conditions, disability status (Equality Act 2010), or pregnancy-related absences.