Bradford Factor Explained: How to Calculate and Use It

The Bradford Factoris a formula used by HR departments across the UK to measure the impact of employee absences. It's designed to highlight patterns of frequent, short-term absences — which are typically more disruptive to a business than longer, planned absences.

The Bradford Factor formula

The formula is straightforward:

The key insight is that S is squared. This means frequent short absences produce a much higher score than a single long absence — even when the total days absent are the same.

Bradford Factor examples

Consider two employees who have both been absent for 10 days in a year:

Alice scores 10 and Bob scores 1,000 despite both taking 10 days off. That gap shows how strongly the formula weights frequent spells; it does not explain why either person was absent or decide what should happen next.

Illustrative Bradford Factor review bands

There are no statutory or universal trigger points. The bands below are an illustration of how an organisation might group scores; your policy should define its own review points and the process that follows.

Advantages of the Bradford Factor

• Consistent calculation — gives managers one repeatable way to summarise frequency and duration before considering context.
• Highlights patterns — identifies employees with frequent short-term absences that disrupt team productivity.
• Simple to calculate — the formula is straightforward and easy to explain to employees.
• Easy to explain — the formula and the spell/day inputs can be shown directly to employees.

Limitations and criticisms

• Disability discrimination risk — employees with chronic conditions may have frequent short absences that inflate their score. Employers must make reasonable adjustments under the Equality Act 2010.
• Doesn't distinguish reasons — a genuine illness and a suspicious Monday absence both count the same.
• Can discourage reporting — employees may come to work ill to avoid triggering thresholds, spreading illness to colleagues.
• Should not be used alone — the Bradford Factor should be one tool among many, not the sole basis for disciplinary action.

Best practices for using the Bradford Factor

1. Document your policy — include the Bradford Factor and trigger points in your absence management policy. Make sure all employees understand how it works.
2. Apply the process consistently — use the same documented starting point while still making reasonable adjustments and considering individual circumstances.
3. Consider context — always investigate the reasons behind high scores before taking action.
4. Account for protected absence — consider disability-related and pregnancy-related absence, reasonable adjustments, and other protected circumstances before relying on a score.
5. Use a rolling 12-month period — calculate scores over the last 12 months, not the calendar year.
6. Automate the calculation — manual tracking is error-prone. Use leave management software to calculate scores automatically.

How Leavely calculates the Bradford Factor automatically

Leavelyautomatically calculates the Bradford Factor for every employee based on their sick leave records. On each employee's profile, managers can see:

• Current Bradford Factor score (rolling 12 months)
• Number of separate absence spells
• Total days absent
• Full sick leave history with dates

No spreadsheets, no manual counting — the score updates automatically as leave records are added.