Free Bradford Factor calculator
Enter the number of separate absence spells and the total days lost, and this Bradford Factor calculator returns the score (S² × D) and its trigger-point band — updated live, as you type.
On this page15 sections
A scoring guide only, based on the figures you enter. Not legal or HR advice.
Results are estimates. Consult a professional.
What is the Bradford Factor?
The Bradford Factor is a score that measures the disruption caused by employee sickness absence. It weights how often someone is absent far more heavily than how long they are absent in total. Ten one-day absences hurt a team more than a single ten-day spell, and the formula is built to reflect that. HR teams use the score to spot patterns of frequent short-term absence and to decide when an attendance conversation is warranted. This Bradford Factor calculator returns the score the moment you enter the number of spells and the total days absent.
The measure takes its name from research linked to the Bradford University School of Management in the 1980s. A 2024 CIPD survey found that around three in five UK employers use a scoring system like the Bradford Factor to monitor and manage sickness absence. It is widely used — and, as this page explains, widely misused.
The Bradford Factor formula: S² × D
The Bradford Factor squares the number of separate absence spells, then multiplies by the total days absent. Squaring the spell count is the entire point: it makes repeated short absences grow much faster than one continuous absence of the same length.
How to calculate a Bradford Factor score
Calculating the score takes three steps. Count the separate spells, add up the total days, then apply the formula. Here is a worked example you can reproduce in the calculator above.
Over the past 52 weeks, an employee has been off sick four separate times, losing twelve working days in total. The pattern is what matters here, not just the day count.
Step 1 — Count the separate spells (S)
The employee returned to work between each absence, so there are four distinct spells. That makes S = 4.
Step 2 — Add up the total days absent (D)
| Spell | Working days lost |
|---|---|
| Spell 1 | 3 |
| Spell 2 | 4 |
| Spell 3 | 2 |
| Spell 4 | 3 |
| Total days (D) | 12 |
Step 2 result: four spells totalling twelve days absent.
Step 3 — Apply the formula
A score of 192 sits in the 125–200 band — high enough that most policies would prompt a manager to review the pattern and have a supportive conversation, but below the 201+ level many employers reserve for a formal attendance review. The next section sets out the bands in full.
Bradford Factor trigger points and score bands
There is no official, legally defined Bradford Factor threshold. Each employer sets its own trigger points in its absence policy. The bands below are the ones most commonly seen in UK workplaces, and they are the bands this calculator uses to label your score.
| Score | Band | Typical response |
|---|---|---|
| 0–49 | No concern | Normal absence levels — no action needed |
| 50–124 | Low concern | Informal, supportive check-in if there is no clear reason |
| 125–200 | Monitor | Review the pattern and discuss it with the employee |
| 201–399 | Formal review | Common threshold for a formal attendance review |
| 400+ | Serious concern | High-priority review under the absence policy |
Illustrative bands only. Thresholds are not set in law — confirm the figures in your own policy.
Why frequent short absences score higher than one long one
The squared spell count is what gives the Bradford Factor its bite. Two employees can lose the same ten working days and end up with wildly different scores, depending on how that time was broken up. Frequent, unplanned single days are harder to cover than one planned block, and the formula rewards that reality.
| Absence pattern | S × S × D | Bradford Factor |
|---|---|---|
| One 10-day absence | 1 × 1 × 10 | 10 |
| Two 5-day absences | 2 × 2 × 10 | 40 |
| Five 2-day absences | 5 × 5 × 10 | 250 |
| Ten 1-day absences | 10 × 10 × 10 | 1,000 |
Same ten days off, four very different scores. Figures match the canonical examples cited by Wikipedia.
This sensitivity is the tool's strength and its weakness at once. It surfaces the disruptive drip-feed of odd days off that a simple day count would hide. But it also means an employee with an unpredictable health condition can rack up a high score through no fault of their own — which is where fairness comes in.
The Bradford Factor and disability: a fairness warning
The formula has no idea why someone is absent. A person with a disability, a chronic illness, or a recurring condition can score highly precisely because their absences are frequent and short — exactly the pattern the score punishes. Acting on that score alone can amount to disability discrimination under the Equality Act 2010.
- Disability-related absence must be treated separately. Employers have a duty to make reasonable adjustments, which can include discounting or adjusting the score for disability-linked absence.
- Pregnancy and maternity absence should be excluded entirely from the calculation — counting it risks pregnancy and maternity discrimination.
- A blanket, one-size-fits-all policy is the danger. Applying the same trigger to everyone, without context, is where indirect discrimination claims arise.
Criticisms of the Bradford Factor
The Bradford Factor is popular because it is simple, but that simplicity is also the source of every serious objection to it. Used as a blunt instrument, it can cause more harm than the absenteeism it aims to manage.
- It has zero context. The score cannot tell the difference between a hangover, a migraine, chemotherapy, or a child's emergency.
- It encourages presenteeism. Staff fearful of points come in sick, spreading infection and working below their best — the trade union Unison has criticised the measure on exactly these grounds.
- It can penalise honesty. An employee may stretch one genuine illness into a single longer spell rather than report two short ones, distorting the very data it collects.
- It is a number, not a judgement. UK employment law turns on fairness, justification, and adjustment — not numerical consistency — so a score-driven decision is legally fragile.
None of this means the score is useless. It means the score is a starting point. Pair it with return-to-work interviews and a clear, well-communicated payroll and absence policy so the number informs a conversation rather than replacing one.
How to use the Bradford Factor fairly
Used well, the Bradford Factor is a signal that helps managers spot problems early and offer support sooner. Used badly, it is a discrimination claim waiting to happen. The difference is process. These steps keep the score on the right side of that line.
- Write your trigger points into policy and share them openly, so the figures are transparent and applied consistently.
- Use the score to prompt a conversation, not a sanction. A trigger should open a supportive return-to-work or attendance discussion first.
- Exclude or adjust protected absence. Discount pregnancy-related absence and make reasonable adjustments for disability before reading the score.
- Look at the reasons behind the pattern. A high score caused by one underlying health issue calls for support, not points.
- Review the policy against Acas guidance, which recommends structured, fair absence procedures over rigid scoring.
Frequently asked questions
What is a high Bradford Factor score?
There is no fixed answer, because each employer sets its own thresholds. As a common guide, scores above 50 may prompt an informal chat, scores above about 125 prompt monitoring, and scores of 201 or more often trigger a formal attendance review. Confirm the figures in your own absence policy.
Is the Bradford Factor a legal requirement?
No. The Bradford Factor is a voluntary HR tool, not a legal standard. There is no law requiring its use and no legally defined trigger point. Acas recommends having a fair, structured absence procedure, but the choice of method is the employer's.
Does the Bradford Factor count days or spells more?
Spells, by a wide margin. Because the spell count is squared, the number of separate absences drives the score far more than the total days lost. Ten one-day absences score 1,000, while a single ten-day absence scores just 10.
Should disability-related absence be included in the score?
It should be handled with care, and usually adjusted or discounted. Penalising an employee for disability-related absence without making reasonable adjustments can amount to discrimination under the Equality Act 2010. Pregnancy-related absence should be excluded from the calculation altogether.
What period does the Bradford Factor cover?
Most policies use a rolling 52-week window, so only absences from the past year count and older spells drop off over time. The period is a policy choice, so some employers use a fixed leave year or a shorter rolling window instead.
Sources and further reading
The formula, the canonical worked examples, and the criticisms on this page are drawn from the sources below. Trigger-point bands are illustrative and vary by employer.
Wikipedia — Bradford Factor (formula S² × D and canonical examples).CIPD — Health and wellbeing at work survey (employer use of absence scoring).Acas — Absence from work and managing sickness absence.UK Government — Equality Act 2010 (disability and discrimination).DavidsonMorris — Bradford Factor explained: meaning, formula and discrimination risk.Frequently asked questions about the free Bradford Factor calculator
About this Bradford Factor calculator
This calculator runs entirely in your browser. Nothing you enter is sent anywhere or stored — the spell count, the days absent, and the resulting score are all computed on your own device as you type.
It is one of the HR and finance tools in our business calculators collection, part of the wider library of free calculators on the site.