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Health and safety KPIs: using leading and lagging indicators
How safe is an operation? Counting accidents gives a poor answer, because it only shows what has already happened. A meaningful set of KPIs therefore combines lagging indicators with leading indicators that reveal whether prevention is working.
Updated 4 min read
Key takeaways
- Lagging indicators such as injury rates, LTIFR and lost days measure outcomes but only react after an event.
- Leading indicators such as action closure rate, inspection compliance and training coverage show whether prevention works.
- KPIs only become comparable with a consistent base, such as per million hours worked.
- A handful of well-defined KPIs with clear ownership has more impact than extensive reporting.
- ISO 45001 requires organisations to monitor and evaluate OH&S performance – KPIs are the main tool for doing so.
Why measure health and safety?
KPIs make health and safety manageable. They show management where the organisation stands, reveal trends over time and allow sites to be compared. For organisations with an ISO 45001 management system they are also expected: clause 9.1 requires you to determine what is monitored and measured, by which methods and when results are evaluated.
Purpose matters most: KPIs should trigger decisions, not fill reports. Every KPI therefore needs a target, an owner and a clear rule on what happens when it deviates.
Lagging indicators: what has already happened
Lagging indicators capture injuries, illnesses and their consequences. They are essential for benchmarking and reporting but of little use as an early warning.
| KPI | Formula | What it tells you |
|---|---|---|
| LTIFR (Lost Time Injury Frequency Rate) | lost-time injuries × 1,000,000 ÷ hours worked | Injury frequency per million hours; widely used internationally |
| TRIR (Total Recordable Incident Rate) | recordable incidents × 200,000 ÷ hours worked | Common in the US; per 100 full-time workers per year |
| 1,000-worker rate (Germany) | reportable accidents × 1,000 ÷ full-time equivalents | Basis of the German accident insurance statistics |
| Severity rate | lost days ÷ lost-time injuries | Average severity of injuries |
| Days without a lost-time injury | days since the last lost-time injury | Easy for the workforce to grasp, statistically weak |
Definitions differ between countries. In Germany, for example, an occupational accident must be reported to the accident insurer if the person dies or is unable to work for more than three days (section 193 SGB VII). Use the threshold that applies locally so your figures remain comparable with official statistics – and state it in every report.
Leading indicators: is prevention working?
Leading indicators measure activities and conditions that prevent harm. They react faster, are meaningful even in smaller operations and can be influenced directly.
| KPI | Formula | What matters |
|---|---|---|
| Action closure rate | actions closed on time ÷ actions due | Shows whether identified deficiencies are actually fixed |
| Overdue actions | number of open actions past their deadline | Early warning of missing resources or unclear ownership |
| Inspection compliance | inspections completed on time ÷ inspections due | Demonstrates that statutory equipment inspections are carried out |
| Training coverage | employees currently trained ÷ employees requiring training | Track per topic, not only as an overall figure |
| Risk assessment currency | areas with a reviewed assessment ÷ all areas | Define in advance when an assessment counts as current |
| Inspections to plan | inspections carried out ÷ inspections planned | Measures the presence of managers and specialists on site |
| Reported near misses | number per period or per 100 employees | A rising count often signals an open reporting culture |
Building a KPI system in five steps
- 1
Start from objectives
Begin with the objectives from your policy and risk assessment, not with whatever data happens to be available.
- 2
Select a few KPIs
Five to eight KPIs are enough for management: two or three lagging indicators and several leading ones.
- 3
Write down definitions
Fix numerator, denominator, period and data source in writing. Only then can values be compared across sites and years.
- 4
Set targets and owners
Each KPI needs a target value and a person who acts on deviations.
- 5
Review regularly
Discuss the KPIs in the safety committee and the management review and derive concrete actions.
Common mistakes
- Reporting only injury numbers and therefore only ever reacting to events.
- Tying targets such as “zero accidents” to bonuses, which can discourage incident reporting.
- Comparing KPIs between sites although they are defined differently.
- Compiling data manually from several spreadsheets, with high effort and risk of error.
Getting KPIs from day-to-day work
Leading indicators are generated where the work happens: in actions, inspections, training and site walks. When these processes run in one system, the KPIs come at no extra effort. In EHS Go the dashboard shows open and overdue actions, upcoming inspections, training status and recent site inspections – per site or for the whole organisation. For the safety committee or management review, lists can be exported as PDF or Excel.
Frequently asked questions
What is the difference between leading and lagging indicators?
Lagging indicators measure outcomes such as injuries and lost days – events that have already happened. Leading indicators measure preventive activities and conditions, such as closed actions or on-time inspections. They reveal the need for action before something happens.
How is LTIFR calculated?
Multiply the number of injuries resulting in at least one lost workday by 1,000,000 and divide by the hours worked in the same period. Some organisations use 200,000 hours as the base; whichever you choose, always state it.
Which KPIs work for smaller organisations?
Mainly leading indicators: action closure rate, inspection compliance and training coverage. Injury rates fluctuate too much in small workforces to support reliable conclusions.
This article provides a general overview and does not constitute legal advice.
