→For HR teams managing absence · line managers tracking attendance patterns
Bradford Factor Calculator
Enter the number of absence spells and total days absent over a 52-week period. Get an instant Bradford Score with score-band interpretation and guidance on next steps.
A spell is any separate period of absence, regardless of length. Three individual sick days count as 3 spells; a 3-day continuous absence counts as 1.
Monitor the pattern. Consider an informal check-in.
Thresholds vary by employer. The Bradford Factor is a management tool, not a disciplinary measure on its own. Always combine with a fair absence review process.
Results are pre-tax estimates for general guidance only — not financial, legal, or tax advice. See disclaimer.
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What is the Bradford Factor and how is it calculated?
The Bradford Factor is an HR tool that puts a single number on an employee's absence pattern over a rolling 52-week period. It was developed at Bradford University School of Management and is widely used by HR teams and line managers across the UK, Australia, and beyond.
The formula
B = S² × D
- S = Number of separate absence spells (occasions) in the rolling 52-week period
- D = Total number of days absent in the same period
- B = Bradford Score
The key insight is the squaring of S. Two employees can have the same total days absent but very different Bradford Scores depending on how those days are distributed.
A worked example
Two employees are each absent for 10 days in a year:
- Employee A had 1 continuous absence of 10 days. Score: 1² × 10 = 10
- Employee B had 10 single-day absences throughout the year. Score: 10² × 10 = 1,000
Same total days, dramatically different operational impact — and a Bradford Score 100 times higher for Employee B.
Common score thresholds
Employers set their own thresholds, but a widely cited framework is:
- 0–49 — Low. Normal absence range; no action typically required.
- 50–99 — Medium. Monitor; consider an informal check-in.
- 100–199 — Warning. A formal absence review meeting is advisable.
- 200–499 — High. HR intervention typically warranted.
- 500+ — Critical. Many policies trigger formal disciplinary proceedings.
Limitations and fair use
The Bradford Factor is a useful pattern-detection tool, not a standalone verdict. It does not account for the reason for absence — a high score may reflect a serious medical condition or a disability covered by employment law. Best practice is to use the score as a prompt for a supportive return-to-work conversation, not as the sole basis for disciplinary action.
If you manage absence formally using the Bradford Factor, your policy should be written down, communicated to employees in advance, and applied consistently across all staff.
This calculator provides general HR guidance only and is not legal or employment law advice. Absence management processes must comply with applicable employment legislation in your jurisdiction.
Frequently asked questions
The Bradford Factor is a formula used by HR and managers to measure the impact of employee absence patterns. It weights frequent short absences more heavily than a single long absence, because intermittent unplanned absences are generally more disruptive to operations. The formula is B = S² × D, where S is the number of absence spells and D is the total days absent.