Bradford Factor Calculator: Complete Guide for UK Employers [2026]

Quick Answer: What is the Bradford Factor Formula?

Bradford Factor = S² x D

Where:

• S = Number of separate absence spells (instances)
• D = Total number of days absent

The formula squares the number of spells, meaning frequent short absences score higher than occasional longer ones.

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Bradford Factor Calculator Examples

Key insight: Same total absence (10 days), but scores range from 10 to 1,000 based on frequency.

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What is the Bradford Factor?

The Bradford Factor is an absence management formula developed at Bradford University School of Management. It helps employers identify employees with patterns of frequent, short-term absences that can be more disruptive to business operations than longer, planned absences.

Why Frequent Absences Score Higher

The formula is designed to reflect the operational impact of absences:

• Single long absence: Easier to plan around, arrange cover
• Frequent short absences: Unpredictable, harder to manage, higher disruption

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Typical Bradford Factor Thresholds

Most UK organisations use these trigger points:

Important: These are guidelines only. Your organisation should set thresholds appropriate to your context.

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How to Use the Bradford Factor Fairly

Do's

✅ Use as one factor in absence management, not the only one ✅ Consider underlying health conditions and disabilities ✅ Apply thresholds consistently across the organisation ✅ Review individual circumstances before taking action ✅ Document conversations and agreed support

Don'ts

❌ Use mechanically without human judgment ❌ Ignore Equality Act 2010 obligations for disabled employees ❌ Apply different standards to different employees ❌ Use retrospectively without prior communication ❌ Treat all absences equally (distinguish legitimate illness)

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Legal Considerations: Disability and Chronic Illness

The Equality Act 2010 requires employers to make reasonable adjustments for disabled employees. This includes:

• Discounting disability-related absences from Bradford calculations
• Adjusting thresholds for employees with chronic conditions
• Not penalising protected absences (pregnancy, maternity)

ACAS Guidance

ACAS recommends that Bradford Factor scores should:

• Trigger a conversation, not automatic disciplinary action
• Be one part of a holistic absence management approach
• Account for underlying causes of absence

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Calculating Your Bradford Factor

Step-by-Step

1. Define the period: Usually 12 rolling months
2. Count separate spells: Each absence instance (even if 1 day)
3. Count total days: Sum all days absent
4. Apply the formula: S² x D

Example Calculation

Employee absence record (12 months):

• 3 days sick (flu) - January
• 1 day sick (migraine) - March
• 2 days sick (food poisoning) - June
• 1 day sick (cold) - September

Calculation:

• S = 4 spells
• D = 7 days
• Bradford Factor = 4² x 7 = 16 x 7 = 112

This score falls in the amber zone (51-124), suggesting informal monitoring.

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Bradford Factor vs Other Absence Metrics

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Implementing Bradford Factor in Your Organisation

1. Communicate the Policy

• Explain the formula and thresholds to all employees
• Include in employee handbook and absence policy
• Ensure managers understand how to apply it fairly

2. Set Appropriate Thresholds

Consider your:

• Industry norms
• Company size
• Nature of work
• Historical absence data

3. Regular Reviews

• Review scores monthly or quarterly
• Adjust thresholds if needed
• Monitor for bias or unfair application

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Using Grove for Bradford Factor Tracking

Grove automatically calculates Bradford Factor scores and provides:

• Real-time dashboards showing all employee scores
• Threshold alerts when employees reach trigger points
• Historical trend analysis to identify patterns
• Automatic exclusions for disability-related absences (configurable)
• Manager notifications when action is needed

Try the free Bradford Factor calculator or get started with Grove.