Bradford Factor Trigger Points: UK Guide

What Is the Bradford Factor?

The Bradford Factor is a formula used by employers to measure the impact of frequent short-term absences on the business. It was developed at Bradford University in the 1980s and has become one of the most widely used absence management tools in UK workplaces.

The formula is straightforward: S squared x D, where S is the number of separate spells of absence over a rolling period (usually 52 weeks), and D is the total number of days absent in the same period.

The reason S is squared is deliberate. It means that someone who has been off three times for two days each (score: 9 x 6 = 54) scores significantly higher than someone who took one long period of 18 days off (score: 1 x 18 = 18), even though both employees have been absent for a similar total number of days. The formula reflects the operational reality that unpredictable, frequent absences cause far more disruption to a small team than a single planned extended spell.

You can calculate scores instantly using our free Bradford Factor calculator, which also shows where a score sits relative to common UK trigger points.

A Worked Example

Here is how the formula plays out in practice.

An employee has three absences in the past 12 months: two days off in January, one day in April, and three days in October. That is three separate spells (S = 3) and six days in total (D = 6).

Bradford Factor score: 3 x 3 x 6 = 54

Now consider a different employee who had one continuous absence of 14 days due to surgery. That is one spell (S = 1) and 14 days (D = 14).

Bradford Factor score: 1 x 1 x 14 = 14

The first employee has a score nearly four times higher, despite being absent for fewer days overall. This is exactly what the formula is designed to surface. From a business operations standpoint, three unpredictable absences across a year create more disruption than a single planned medical leave you can prepare for.

Common Bradford Factor Trigger Points

There are no trigger points set by UK law. Employers choose their own thresholds based on the size of their team, the nature of the work, and their existing absence history. That said, several benchmarks have become widely used across UK businesses:

These figures are a starting point, not a rulebook. A business with a field-based team may be more sensitive to absence than an office-based team. A smaller employer may set lower thresholds because every single absence directly affects service delivery.

Whatever thresholds you set, document them in your absence policy, communicate them to all employees, and apply them consistently. Inconsistency is one of the most common reasons absence-related employment tribunal claims succeed.

Bradford Factor for Part-Time Workers

The fairness question around part-time workers comes up frequently, and rightly so.

Consider two employees: one works full-time (five days a week) and one works part-time (three days a week). Both have three separate absences in a year. The part-time employee will naturally have fewer total days absent simply because they work fewer days, which lowers their D score. However, each absence spell counts the same in the S calculation, and the disruption to the team may be proportionally just as significant.

There is no single standard approach to resolving this. Options used in practice include:

• Pro-rating the day count to reflect contracted hours (for example, dividing actual days absent by the percentage of full-time hours worked)
• Setting separate trigger thresholds for part-time staff
• Considering absences in context rather than applying rigid scores alone

Whatever approach you choose, consistency matters. If you apply different rules to different employees without a clear, documented rationale, you risk discrimination claims. Our absence management team can help you design a policy that works fairly across your workforce.

Using the Bradford Factor Fairly and Legally

The Equality Act 2010

The most important legal safeguard to understand is the Equality Act 2010. If an employee's absences are related to a disability (a physical or mental impairment with a substantial and long-term adverse effect on their ability to carry out normal day-to-day activities), those absences must be excluded from Bradford Factor calculations.

Counting disability-related absence towards a trigger threshold and then taking formal action as a result could constitute discrimination arising from disability under section 15 of the Equality Act. There is no minimum length of service required to bring this kind of claim.

Before applying any trigger or taking any formal action, ask yourself whether the pattern of absence could be connected to a health condition or disability. If in any doubt, take advice before proceeding.

Other Protected Characteristics

Pregnancy-related absence must also be excluded from Bradford Factor calculations. Taking action against an employee whose absences are pregnancy-related is unlawful under the Equality Act and could also constitute automatic unfair dismissal.

You should also consider whether absence patterns might be connected to other protected characteristics, such as a religious observance or a caring responsibility. The Bradford Factor is a useful starting point but never a complete picture.

Trigger Points Are Not a Sanction

This point bears emphasis because it is where many employers get into difficulty. A Bradford Factor score reaching a trigger threshold does not give you grounds to dismiss or formally discipline an employee. It gives you grounds to have a conversation.

That conversation should be a welfare or return-to-work meeting, held in private, focused on understanding the reasons behind the pattern. You may find there is a health condition the employee has not disclosed, a workplace problem contributing to absence, or simply a period of bad luck. The outcome of that conversation determines what happens next, not the number itself.

For a step-by-step guide to formal absence management processes, including when and how to escalate, see our disciplinary procedures guide and the broader managing employee absence guide.

Building a Consistent Absence Policy

The Bradford Factor works best as one part of a wider absence management framework, not as a standalone tool. The elements that make it effective are:

A written absence policy that sets out trigger points, how they are applied, what happens at each stage, and which absences are excluded from calculations (disability-related, pregnancy-related, and any others you choose to exclude).

Consistent return-to-work interviews after every absence. These are consistently cited as one of the most effective absence management tools and give you the context behind the score.

Regular score reviews on a rolling basis so that old absences drop out and the picture stays current.

Training for line managers so that every manager handles absence the same way, regardless of which team or department is involved.

If you are setting up or refreshing your absence policy, or you have a specific case where Bradford Factor scores are becoming a concern, our team can help you get the process right from the start.

When Absence Becomes a Formal Matter

If an employee continues to trigger thresholds after appropriate support has been offered and documented, a formal capability or attendance management process may become necessary. This is distinct from a disciplinary process for misconduct, though the two are sometimes confused.

Under the Employment Rights Act 1996, dismissal must be for a fair reason and follow a fair procedure. Persistent absence can be a fair reason (capability or some other substantial reason), but the process leading up to any dismissal decision needs to be thorough, documented, and consistent with your policy.

The Equality Act issues described above apply throughout. If you have any reason to think a disability may be involved, always seek advice before dismissing.

Getting Absence Management Right

The Bradford Factor is one of the most practical tools available to UK employers for managing short-term absence patterns, but its value depends entirely on how it is used. Applied thoughtfully, with proper exclusions, consistent communication, and a genuine focus on supporting employees rather than punishing them, it helps you have earlier, better conversations about absence before problems escalate.

If you would like help setting up a fair and legally robust absence management framework, including trigger points tailored to your business, get in touch with our team to book a free initial consultation.