Bradford Factor Calculator

The Bradford Factor is an HR formula used to measure worker absenteeism. It operates on the principle that frequent, unplanned short-term absences create significantly more operational disruption than infrequent, long-term medical leaves.

To use the Bradford Factor Calculator, enter your Number of Absence Instances (Spells S), Total Days Absent (Total Days D). The calculator instantly computes Bradford Factor Score, HR Concern / Action Trigger Level and more. Results update in real time as you change any input — no submit button needed.

How to Use This Calculator

Enter your Number of Absence Instances (Spells S) (e.g. 4 in instances) and Total Days Absent (Total Days D) (e.g. 10 in days). Results update instantly as you type — no submit button or page reload required. Adjust any value to compare scenarios side by side.

The Formula

Bradford Factor Formula: B = S² × D

Where S = Number of separate instances (spells) of absence in 52 weeks, D = Total number of days absent in 52 weeks.

Worked Example

Employee A: 1 instance of 10 consecutive days absent. Bradford Score = (1)² × 10 = 10 (Low concern).

Employee B: 5 separate instances of 2 days absent (total 10 days). Bradford Score = (5)² × 10 = 250 (Moderate-high HR concern requiring review meeting).

Understanding Your Result

Evaluate your result against the specific financial decision driving this calculation. Small input differences can create large output swings — run two or three scenarios (conservative, base, optimistic) to understand the range of outcomes. For decisions involving more than a month's income, validate your result against a second source or consult a certified financial planner (CFP) or CPA depending on the tax implications.