AIFR Calculator
Calculate your organization's All Injury Frequency Rate instantly.
What is All Injury Frequency Rate (AIFR)?
The All Injury Frequency Rate (AIFR) is a critical key performance indicator (KPI) used in Occupational Health and Safety (OHS) to benchmark an organization's safety performance. It quantifies the number of recordable injuries relative to the total number of hours worked by employees.
Unlike metrics that only track lost-time injuries, the AIFR provides a broader view of safety by including all recordable incidents, such as medical treatment cases and restricted work cases, regardless of whether time was lost. This helps safety managers identify trends and implement preventative measures before more severe accidents occur.
The AIFR Formula
The standard calculation normalizes injury data to a base of 100 full-time employees working 40 hours a week for 50 weeks a year (which equals 200,000 hours). The formula is:
- Total Recordable Injuries: The sum of all fatalities, lost time injuries, restricted work cases, and medical treatment cases.
- 200,000: The standardization constant (100 employees × 40 hours × 50 weeks).
- Total Hours Worked: The actual total man-hours worked by all employees (including overtime, excluding leave) during the period.
Why Calculate AIFR?
Calculating your AIFR is essential for several reasons:
- Benchmarking: It allows companies of different sizes to compare safety performance on an "apples-to-apples" basis.
- Trend Analysis: Tracking AIFR over months or years helps determine if safety programs are effective.
- Contract Bidding: Many clients require contractors to submit their AIFR (or TRIR) as part of the pre-qualification process for tenders.
Example Calculation
Let's look at a practical example of a construction company over the course of one year.
| Metric | Value |
|---|---|
| Medical Treatment Cases | 3 |
| Restricted Work Cases | 1 |
| Lost Time Injuries | 2 |
| Total Recordable Injuries | 6 |
| Total Hours Worked | 450,000 |
Using the calculator above or the formula manually:
Calculation: (6 × 200,000) ÷ 450,000 = 2.66
This means the company experienced 2.66 injuries per 100 full-time equivalent employees during that year.
How to Improve Your AIFR Score
A lower AIFR indicates better safety performance. To improve your score:
- Enhance Reporting: Encourage reporting of near-misses to address hazards before they cause injury.
- Safety Training: Conduct regular toolbox talks and safety induction training.
- Hazard Assessments: Regularly review Job Safety Analyses (JSAs) and risk assessments.
- Incident Investigation: Thoroughly investigate all recordable injuries to prevent recurrence.