Bradford Factor Calculator

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Bradford factor (B)

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What is Bradford Factor?

The Bradford factor is an absence-pattern score calculated from the number of separate absence spells and the total days absent in a defined period. Because it squares the spell count, several short spells produce a higher result than one continuous spell with the same total days. That weighting is the main feature to understand before using the number.

This calculator performs the arithmetic only. It does not know why someone was absent, what their work schedule is, whether a policy excludes particular absences or what support may be appropriate. A numerical score cannot determine whether an employee has acted improperly. If an organisation uses the factor as one review indicator, the score needs accurate records, a stated policy and a fair assessment of individual circumstances.

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How to Use This Calculator

  1. Choose the observation window before counting, for example the twelve months ending on a specific date. Use that identical window for spells and days.
  2. Count separate spells of absence according to the policy being used. A continuous three-day absence is ordinarily one spell for this arithmetic, rather than three separate occurrences.
  3. Count the total included absence days in the same window. Clarify how part-days, non-working days and excluded absence types are handled before entering totals.
  4. Enter spells as S and days as D, then calculate. The program squares S and multiplies by D; it does not apply any review thresholds or sanctions.
  5. Keep the underlying dates and counting rules with the score. For a changed score, inspect which spell entered or left the reporting window rather than assuming that the change describes a new attendance problem.
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Formula Used

Bradford factor B = S²×D, where S is separate absence spells and D is total included absence days in the same period.
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Variables Explained

InputMeaning in this calculator
No of times absent, SNumber of distinct spells included by the chosen recordkeeping policy. This count is squared.
Days absent, DTotal included absence days across those spells. Do not enter days worked or divide days by spells.
Observation periodThe shared reporting window, maintained outside this form. The calculator has no date-range selector.
Bradford factorA weighted numerical score. It is not a percentage of time absent or an explanation of an absence’s cause.
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Worked Example

Three spells totalling six days give S =3 and D =6. Squaring the spell count gives 9, then 9×6 =54. One six-day spell gives 1²×6 =6. Six one-day spells give 6²×6 =216. All three examples contain six days off, but the score ranges widely because it is designed to weight frequency.

For a sensitivity check, start with two spells and five days:2²×5 =20. If a third one-day spell is added, the totals become three spells and six days, giving 54. That jump is not simply six extra points for a day; the larger spell count changes the multiplier applied to every included day. This is why a recordkeeping error in the number of spells can have a particularly large effect.

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Why Use This Calculator?

The result is best understood as a summary of the stated counting convention. It cannot distinguish a recurring health condition, a temporary infection pattern, caring responsibilities or another reason for absence. Nor can the form tell whether two adjacent records should be treated as one continuous spell. Those questions must be resolved before calculating or interpreting a score.

Acas guidance describes absence review points as prompts to review circumstances rather than automatic disciplinary decisions. The legal and policy treatment of particular absences depends on the context and jurisdiction. This page therefore supplies no universal trigger value, and a score from one organisation should not be compared with another without comparing their recording windows and exclusions. A simple percentage of working time lost answers a different question and may be useful alongside the spell-weighted number.

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Common Mistakes

    • Do not enter each day of one continuous absence as a separate spell merely because the payroll system stores daily rows.
    • Do not mix a year’s spell count with a month’s day count.
    • Do not interpret the result as a universal disciplinary threshold. The calculator has no employment-policy or legal decision function.
    • Do not compare scores from different counting policies without checking exclusions, part-days and the reporting window.
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Frequently Asked Questions

Is the Bradford factor an absence percentage?

No. Three spells totalling six days give 54, but 54 does not mean 54%of working time was missed. An absence percentage would require a denominator such as scheduled working days or hours. The Bradford expression does not include that denominator.

Why does another spell increase the score so much?

The spell count is squared before multiplying by days. Increasing S from 2 to 3 changes its multiplier from 4 to 9. If the day total also rises, both changes affect the final number. This nonlinear behaviour is intentional in the formula, not an extra penalty added by the calculator.

Can the same score represent different patterns?

Yes. Four spells totalling four days give 64; two spells totalling sixteen days also give 64. The total alone therefore does not reconstruct the underlying absence record. Keep both S and D, and the original dates, when reviewing a score.

What threshold should an employer use?

This calculator does not set one. Any review process should be based on an appropriate policy and the individual circumstances, with jurisdiction-specific obligations considered. A number alone cannot decide whether a particular absence should be included or what action is appropriate.

Why can a rolling score fall without a new attendance change?

An older spell or its days may leave the observation window. That changes S or D even when nothing new has happened this week. When comparing rolling totals, record the window end date and check the events that entered or expired.

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Sources & References

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