Score absence patterns, giving extra weight to frequent short spells.
125 or more: often triggers a formal review.
Please do not make financial decisions based on these results.
What is the Bradford Factor Calculator?
Score absence patterns, giving extra weight to frequent short spells. To use the Bradford Factor Calculator, enter number of absence spells in 52 weeks, total days absent; it returns bradford factor, average spell length (days), and shows them instantly as you type.
Where the Bradford Factor Calculator fits
Score absence patterns, giving extra weight to frequent short spells. The main figure it returns is the Bradford factor, worked out from the values you enter.
It belongs with the other hr & workforce tools. If you are comparing options or checking a result from another angle, try the Absence Percentage Calculator, Attrition Rate Calculator or the Turnover Rate Calculator.
How to use the Bradford Factor Calculator
- Enter your numbers. Start with Number of absence spells in 52 weeks, Total days absent. Use real figures from your own records where you can. Fields marked optional can stay at zero.
- Read the result. The highlighted box gives the Bradford factor, and the cards below show Average spell length (days). Tables and charts break it down further.
- Test other scenarios. Results update as you type. Change one value at a time to see what drives the answer, and press Reset to go back to the defaults.
Formula and how it works
Example with real numbers
Here is the Bradford Factor Calculator using the default values shown in the calculator above:
Inputs
| Number of absence spells in 52 weeks | 4 |
|---|---|
| Total days absent | 9 |
Results
| Bradford factor | 144 |
|---|---|
| Average spell length (days) | 2.3 |
With these inputs the calculator returns Bradford factor: 144. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Number of absence spells in 52 weeks from 4 to 4.8 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| Bradford factor | 144 | 207 | +44% |
| Average spell length (days) | 2.3 | 1.9 | -16.7% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
What the results tell you
The results panel of the Bradford Factor Calculator reports Bradford factor and average spell length (days). Compare these figures while changing one input at a time, and use the related calculators below to look at the same situation from another angle.
Method and limits. This calculator applies the formula in the section above to your inputs, in your browser; nothing you enter is stored on our servers. The result is only as accurate as the numbers you enter and the formula shown above. It is for information, not financial, tax or legal advice.
Frequently asked questions
Why does the Bradford factor punish short absences?
Many short spells disrupt work more than one long absence, so the formula squares the number of spells.
Are the safety rates the OSHA method?
Yes. TRIR and DART use the OSHA formula with the 200,000-hour base.
Are the HR formulas legal advice?
No. They are standard measures for planning and reporting. Employment rules vary by country and state, so check local law for pay and leave.
Are the results guaranteed?
No. Results depend entirely on the numbers you enter and the formulas shown on this page. Please do not make financial decisions based on them alone; confirm important figures with a licensed professional.
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