What is the Bradford Factor?

The Bradford Factor is an HR measurement tool that quantifies the impact of employee absence on the workplace. It was developed by Bradford University. The formula is S² × D, where S = number of absence spells and D = total days absent. Frequent short absences score much higher than one long absence of the same total days, reflecting the disproportionate disruption caused by unpredictable short-term absence.

What is the Bradford Factor formula?

Bradford Factor = S² × D. S is the number of separate absence episodes in a rolling 52-week period. D is the total number of days absent in the same period. For example: 3 episodes totalling 9 days = 3² × 9 = 81. But 9 separate 1-day absences = 9² × 9 = 729 — nearly 9× higher for the same total days, because each spell causes more disruption.

What Bradford Factor score triggers formal action?

Trigger points vary by employer, but common thresholds are: 0–99 (no action), 100–199 (verbal warning or welfare review), 200–299 (written warning), 300–399 (final written warning), 400+ (dismissal consideration). These are guidelines — always apply them consistently and with HR advice.

Is the Bradford Factor legally binding?

No. The Bradford Factor is a management tool, not a legal requirement. It provides an objective starting point for absence conversations but must not be applied mechanically. Absences related to disability, pregnancy, or maternity leave should generally be excluded. Any disciplinary action must follow a fair process under employment law.

How long is the Bradford Factor rolling period?

The standard rolling period is 52 weeks (one year). When calculating, you only count absences that occurred in the past 52 weeks from today. Older absences drop off as time passes, which means scores naturally reduce over time if absence improves.

Should disability-related absence be included in the Bradford Factor?

No — generally, absences that are a consequence of a disability (as defined by the Equality Act 2010) should be excluded from Bradford Factor calculations. Including them could amount to indirect discrimination. Employers should consult HR or legal advice when dealing with absence related to disability, long-term health conditions, or pregnancy.

Bradford Factor Calculator | Absence Score & Trigger Levels

Calculate Bradford Factor absence scores using the S² × D formula. Add each separate absence episode, enter the days, and instantly see the score and formal action trigger level.

Bradford Factor: The Complete Guide for UK Employers

The Bradford Factor is one of the most widely used absence management tools in UK HR. It assigns a numerical score to each employee's absence pattern, helping managers identify those whose short-term absence is causing disproportionate operational disruption.

The Bradford Factor Formula Explained

Bradford Factor = S² × D

Where:

S = the number of separate absence spells in the rolling 52-week period
D = the total number of days absent in the same period

The key insight is that S is squared. This means frequent short absences generate exponentially higher scores than a single long absence with the same total days.

Bradford Factor Examples

Absence Pattern	Episodes (S)	Total Days (D)	Score (S² × D)
One 10-day illness	1	10	10
Two 5-day absences	2	10	40
Five 2-day absences	5	10	250
Ten 1-day absences	10	10	1,000
Three absences (1+2+3 days)	3	6	54

Standard Trigger Thresholds

Different organisations use different thresholds. The most common structure is:

0–99: No formal action needed — monitor
100–199: Verbal warning or informal welfare review
200–299: Written warning
300–399: Final written warning
400+: Consideration of dismissal

Legal Considerations

The Bradford Factor is a management aid, not a legal process. Employers must:

Apply thresholds consistently to all employees
Exclude absences related to disability (Equality Act 2010), pregnancy, or maternity — including these risks indirect discrimination claims
Conduct a return-to-work interview after every absence before calculating scores
Follow a fair disciplinary procedure before any formal action
Consider each case on its individual facts — not just the score

Managing Absence Effectively

The Bradford Factor works best as part of a broader absence management policy. Use it alongside SSP calculations to understand the cost of absence, and factor sick pay liabilities into your overall employee cost planning.

Bradford Factor Calculator