Bradford Factor Calculator Guide: How to Use Short-Term Absence Signals Carefully

What the Bradford Factor is designed to show

The Bradford Factor emphasizes frequency of absence rather than total days alone. That makes it useful in roles where repeated short absences create more operational disruption than one longer absence spell.

Its value is not in proving intent. Its value is in showing which attendance patterns deserve closer review.

Why careful interpretation matters

Attendance data can intersect with disability accommodation, protected leave, family obligations, and wellbeing concerns. A score should never be treated as a disciplinary conclusion on its own.

The calculator is most useful when it supports consistency and early review, not automatic escalation.

What to do after the score appears

Review the pattern against policy exclusions, protected categories, and manager context before drawing conclusions. Then compare the case with overall absence rate, overtime pressure, and workload strain.

The best next step is usually a case review or support conversation, not an immediate administrative response.

Why this matters

• Highlights disruptive short-term absence patterns quickly.
• Supports more consistent attendance review.
• Helps separate case-review needs from raw absence totals.

Method, scope, and sources

Employer-policy attendance-management convention: Bradford Factor = S² × D, where S is policy-included absence spells and D is total policy-included absence days in the same defined review period. More spells necessarily score higher when days are fixed.

The Bradford Factor is not a universal government statistical standard. The review period, spell-linkage rule, included/excluded categories, scheduled-day basis, part-time treatment, and thresholds belong to the organization’s documented policy. A score is a frequency-weighted attendance-pattern signal, not an absence rate, performance measure, proof of misconduct, or disciplinary determination. Acas guidance is Great Britain-specific.

Method status: Partially supported.

Worked example

Hypothetical only: a written 12-month attendance policy counts three separate sickness-absence spells and seven included scheduled workdays after its exclusions. B = 3² × 7 = 63. The result does not establish risk, misconduct, or an action; the organization must apply its own contextual review process.

Sources

• South Oxfordshire and Vale of White Horse District Councils — Sickness Absence Policy: Directly states the formula as number of times absent × number of times absent × total days absent, and illustrates local choices for rolling period, linkage, part-time treatment, and threshold.
• Acas — Absence trigger points: Says there are no legal rules on when/how absence should be reviewed; the employer should set out its own system and use review points to start a review, not automatically discipline.
• Acas — Disability-related absence – Supporting disabled people at work: Supports Great Britain-specific individual consideration for disability-related absence, including adjustments to counting or trigger points where applicable.