Calculate a Bradford Factor absence score from absence spells and days lost, then review trigger bands, annualized score, and short-absence sensitivity.
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Weight repeated short absences more heavily than days lost alone Combine absence spells and total days absent to calculate the Bradford Factor, then compare the score with a policy trigger and see how quickly extra spells can push the score higher.
Quick absence patterns
The presets show why a repeated short-absence pattern can score much higher than the same number of days in one continuous spell.
Common trigger scores
Assumptions
This planner uses the common Bradford formula of spells squared multiplied by days lost. It is a policy support tool only, and trigger scores differ by employer, contract, and absence-management rules.
Typical trigger bands
0-20
Low monitoring range
21-99
Review range
100-299
Trigger range
300-499
High trigger range
500+
Very high trigger range
Result
144 Bradford Factor
4 absence spells and 9 days lost produce a Bradford score of 144 across 12 months.
Trigger band
Trigger range
Annualized score
144
Average days per spell
2.25
Difference to trigger
44
One more spell adds
81
One more day adds
16
Bradford score is above the trigger Frequent short absences are pushing the score above the trigger entered and may justify a closer attendance review. Trigger bands are examples only; apply your own policy, review period, and exclusion rules.
A Bradford Factor calculator helps HR teams and managers calculate an absence score from separate absence spells and total days absent. The formula squares the number of absence occasions and multiplies by days lost, so repeated short absences score much higher than one continuous absence with the same total days.
What the Bradford Factor is measuring
The Bradford Factor is an attendance-pattern score, not a total-time-lost measure alone. One longer absence can produce a lower score than the same number of days taken in several shorter absences, because the metric is specifically designed to weight frequency more heavily than duration.
That is why the score often appears in attendance-management policies. It is meant to help employers spot patterns of repeated short absence that may create more operational disruption than one continuous period away from work.
The calculator is most useful when it is paired with a clear review period, a known policy trigger, and consistent absence definitions. Without those policy rules, the score is only a mathematical signal.
The Bradford formula and trigger view
This calculator uses the common Bradford formula of absence spells squared multiplied by total days absent. It also annualizes the score over the review period entered, compares the result with an optional trigger score, and can normalize days lost by average employees when you want basic per-employee context for the same period.
The trigger support is useful because it converts a policy threshold into something operational. At the current number of spells, you can see how many total days absent would still fit under the trigger, and at the current days lost you can see how many whole spells would still stay below it.
The page also shows what happens if one more absence spell is added while total days stay the same. That scenario is often more revealing than adding one more day, because the squared spell count is what makes Bradford scores rise sharply.
Bradford Factor = Absence spells² x Total days absent
The standard attendance-pattern score used to weight frequency more heavily than duration.
Annualized Bradford score = Bradford Factor x (12 / Review period in months)
A comparison view that scales the current-period score to a 12-month equivalent.
Score after one more spell = (Absence spells + 1)² x Total days absent
Shows how quickly the score can increase if absence is split into another separate occasion.
Worked example: one long absence versus repeated short absences
Suppose one employee has one absence spell lasting 10 days. The Bradford score is 1 x 1 x 10, or 10. Another employee has the same 10 total days absent split across 5 separate spells. That score is 5 x 5 x 10, or 250.
The total days absent are identical, but the repeated short-absence pattern creates a much higher Bradford score. That is the main reason HR teams use the Bradford score as a separate absence-pattern metric rather than relying only on total days lost.
If a policy trigger is 100, the first pattern is far below the trigger and the second pattern is above it. That does not automatically decide the outcome, but it does show why the pattern needs a different management conversation.
Common Bradford score trigger bands
There is no universal legal trigger scale. Many employers set internal bands such as low monitoring, informal review, formal trigger, high trigger, and very high trigger, but the exact thresholds vary by contract, sector, review period, and absence policy.
This calculator uses example bands to help interpret the number: 0-20, 21-99, 100-299, 300-499, and 500+. Treat those as planning labels, not automatic action levels. Your organization's policy should decide which threshold matters.
A good Bradford Factor calculator should therefore let you enter the policy trigger that actually applies rather than forcing one fixed scale. It should also make clear that trigger points start a review process; they do not replace context, support, medical information, disability considerations, or fair procedure.
Why Bradford scores need careful use
A Bradford score is a discussion aid, not a disciplinary decision on its own. Disability-related absence, pregnancy-related absence, long-term sickness, and other protected or policy-excluded categories may need to be handled differently from general short-term attendance review.
It is also important not to assume trigger levels are universal. Different employers use different thresholds, different review periods, and different absence exclusions, so the same raw score can have very different consequences depending on the policy framework around it.
The fairest use is to combine the score with return-to-work conversations, consistent recording, occupational-health or medical context where appropriate, and transparent policy rules that employees can understand before a threshold is reached.
Use this page when the question is about repeated short-absence scoring. If the question is how much scheduled working time was lost overall, an absence percentage calculator is a better fit because it compares absent days with the available working-day base.
Use turnover or attrition calculators when the issue is workforce movement rather than sickness absence. Use full-time-equivalent planning when you need to normalize labour exposure, headcount, or workload.
The Bradford Factor formula is absence spells squared multiplied by total days absent. It is often written as S² x D = B, where S is separate absence spells, D is total days absent, and B is the Bradford score.
Why does the Bradford score rise so quickly when absence spells increase?
Because the number of spells is squared before being multiplied by days absent. Frequency therefore has a much bigger effect than total days lost alone.
Does the same number of days absent always produce the same Bradford score?
No. The score changes if those days are spread across more or fewer separate absence spells. Ten days in one spell scores 10, while ten days across five spells scores 250.
What is a Bradford Factor trigger point?
A trigger point is an internal policy threshold that prompts a review, conversation, or management process. It is not a universal legal threshold, and different employers set different trigger levels.
What is a high Bradford score?
There is no universal definition. Some policies treat scores above 100 as a trigger range, while others use different levels. The score is high only in relation to the review period, policy threshold, absence definitions, and employee context being used.
What does annualized Bradford score mean?
It scales the current-period score to a 12-month equivalent so different review periods can be compared more easily. It is a comparison aid, not a forecast.
Should Bradford scores be used on their own?
No. The score is only one attendance signal. Employers still need to apply policy fairly and consider protected, disability-related, pregnancy-related, long-term sickness, or otherwise excluded absence contexts.
Should disability-related absence count in a Bradford score?
That depends on the employer's policy and legal context, but disability-related absence often needs separate consideration and reasonable adjustments. Do not rely on the score alone for disability-related attendance decisions.
Is the Bradford Factor suitable for long-term sickness?
It is mainly designed to highlight repeated short absences. Long-term sickness usually needs a separate long-term absence process, medical context, and support review rather than a simple Bradford trigger.
Can an employer choose different trigger levels?
Yes. Employers can set their own trigger levels, review periods, and absence exclusions, subject to policy, contract, and legal requirements. That is why this calculator lets you enter a policy trigger instead of assuming one universal threshold.
How do I reduce a Bradford score?
Mathematically, the score falls in future review periods when older absence spells or days leave the rolling window. Operationally, the useful response is to understand causes, support attendance, record absences consistently, and follow the employer's policy fairly.
