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# AFR / IFR & Safety Metrics Overview

# AFR / IFR & Safety Metrics Overview

## 1. Frequency Metrics

### ${color}[#6e97c9](Core Metrics)

#### AFR – Accident Frequency Rate
Measures reportable injuries relative to total hours worked.

**Formula:**  
AFR = (RIDDOR-reportable injuries × 100,000) / Total hours worked  

**Standard:**  
UK Health and Safety Executive (HSE)



#### IFR / TRIFR – Incident / Total Recordable Injury Frequency Rate
Measures all recordable incidents relative to total hours worked.

**Formula:**  
IFR = (Recordable incidents × 200,000) / Total hours worked  

**Standard:**  
OSHA (USA)



### ${color}[#4f81bd](Other Configurable Metrics)

#### LTIFR – Lost Time Injury Frequency Rate
Measures injuries that impact productivity (time lost).

**Includes:**
* Lost Time Injuries (LTI)
* Fractures requiring time off
* Serious sprains/strains
* Surgical cases

**Excludes:**
* First Aid cases
* Medical Treatment cases with immediate return
* Near misses

**Formula:**  
LTIFR = (Lost Time Injuries × Multiplier) / Total hours worked



#### AIFR – All Injury Frequency Rate
Captures all injuries across the severity spectrum, providing the most complete picture of injury frequency.

**Includes:**
* LTI, MTI, RWC
* Minor injuries (e.g. stitches)
* Restricted work cases

**Excludes:**
* Near misses (no injury)
* Hazard observations

**Formula:**  
AIFR = (All injuries × Multiplier) / Total hours worked



#### SIFR – Serious Injury Frequency Rate
Measures high severity incidents (life-changing or fatal risks).

**Includes:**
* Fatalities
* Permanent disabilities
* Major fractures
* Serious head injuries

**Excludes:**
* Minor injuries
* First Aid
* Low-risk medical cases

**Formula:**  
SIFR = (Serious injuries × Multiplier) / Total hours worked



## 2. Supporting Indicators

#### SIFp – Serious Injury / Fatality Potential
Identifies incidents that had the potential to result in serious harm or fatality, even if the outcome was minor.


#### SSR – Safety Observation / Reporting
Represents proactive safety reporting activities such as observations, hazard reports, and improvements.


#### HIPO – High Potential Incident
An incident that could have resulted in serious injury or fatality under slightly different circumstances.



## 3. Onos Calculation Logic

The system can use either:
* **Actual recorded monthly hours** or  
* A **calculated method** based on configured working assumptions by number of people 

Note: This behaviour can be configured or hidden as required.


### Calculated Method

**Frequency Rate:**  
Frequency Rate = (Incidents / Hours) × Multiplier  

**Monthly Hours Calculation:**  
Monthly Hours = Users x Avg. weeks in month × Avg. hours in day × Avg. days in week × optional uplift  

**Example:**  
Hours = 4.0833 × 9 × 5 × 1.05  



## 4. Data Sources

* Workforce hours (employees, subcontractors, visitors)  
* Incident records  



## 5. Dashboard Overview

The AFR / IFR dashboard includes:

* AFR / IFR summary cards (Actual vs Target)  
* Trend charts (e.g. rolling 12 months)  
* Safety Pyramid (incident distribution by severity)  
* Incident breakdown by type  



## 6. Configuration

### Default

* AFR = 100,000 multiplier  
* IFR = 200,000 multiplier  

### Custom

* Adjustable multipliers  
* Working hours configuration  
* Workforce inclusion rules  
* Optional uplift factor  



## 7. Metrics Summary Table

### Core Metrics

| Metric | Full Name | What it Measures | Typical Includes | Notes |
| ---- |
| AFR | Accident Frequency Rate | Reportable injuries relative to hours worked | RIDDOR-reportable injuries | UK HSE standard (per 100,000 hours) |
| IFR / TRIFR | Incident / Total Recordable Injury Frequency Rate | All recordable injuries relative to hours worked | LTI, MTI, RWC | OSHA-aligned (per 200,000 hours) |



### Key Metrics (Next Most Important)

| Metric | Full Name | What it Measures | Typical Includes | Notes |
| ---- |
| LTIFR | Lost Time Injury Frequency Rate | Injuries causing lost work time | Lost Time Injuries (LTI) | Focus on productivity impact |
| AIFR | All Injury Frequency Rate | All injuries across severity levels | LTI, MTI, RWC, sometimes First Aid | Broadest injury view (configurable) |
| SIFR | Serious Injury Frequency Rate | High severity / life-changing injuries | Fatalities, major injuries | Focus on consequence |



### Supporting Metrics

| Metric | Full Name | What it Measures | Typical Includes | Notes |
| ---- |
| SIFp | Serious Injury / Fatality Potential | Potential severity of incidents | High-risk near misses or low-outcome events | Leading indicator |
| SSR | Safety Observation / Safety Reporting | Proactive safety reporting activity | Observations, hazard reports | Measures safety culture |
| HIPO | High Potential Incident | Incidents with potential for serious harm | High-risk near misses | Often overlaps with SIFp |