What are LTIF, TRIR and the vehicle crash rate?
LTIF (lost time injury frequency) is the number of lost time injuries per million hours worked. TRIR (total recordable injury rate) counts every recordable case, not only those with days off work. Oil and gas clients such as national oil companies and their main contractors ask for both every month, and IOGP reports them per million hours for its members and their contractors.
Driving is the other number that matters on these contracts: IOGP notes that driving-related incidents have historically been the single largest cause of fatalities in its member companies' operations. The motor vehicle crash rate divides crashes by the distance driven, so a fleet that drives more is compared fairly. This calculator works out all three for one period, follows them month by month, and shows where the year ends against your client's targets.
Why work out the rates yourself?
- Clients compare contractors on them: the rates go into the monthly HSE report, the contractor review and often the next tender.
- The basis must match: some clients use 1,000,000 hours, others the US 200,000-hour basis. A TRIR of 1.0 per million hours is 0.2 per 200,000 hours.
- One case moves a small contractor a lot: with 500,000 hours a year, each recordable case adds 2.0 to the TRIR. Knowing that early changes how you plan the rest of the year.
- Crash rates need distance: the count of crashes alone says little when the fleet's kilometers change from month to month.
What inputs do you need?
| Input | Where to find it | Tip |
|---|---|---|
| Work hours | Timesheets, payroll or the site manhours report | Use the same people the injury figures cover, including your subcontractors if the client asks for them. |
| Injury cases by type | Your incident register | Count each case once, at its most serious outcome. First aid cases are not recordable. |
| Days lost | Incident register and HR records | Optional; gives the severity rate. |
| Distance driven | Tracking system reports or odometer readings | Same vehicles and period as the crash count. |
| Crashes | Vehicle incident log | All crashes of work vehicles on duty; the Vehicle Accident Report Form records each one. |
How is it calculated?
Injury rates
The case types follow IOGP's safety performance indicators, where the recordable rate counts fatalities, lost work day cases, restricted work day cases and medical treatment cases. The 200,000-hour basis is the US one: 100 full-time workers at 40 hours a week for 50 weeks.
Vehicle crash rate
Trend and targets
The tool has no targets of its own. The targets on the Targets tab are examples; enter the ones in your contract. The IOGP figures shown in the results are industry averages for reference, not targets.
Sources
- Case types and the per-million-hours basis: IOGP, Safety performance indicators – 2019 data (report 2019se, September 2020). Source: IOGP.
- 2024 averages (lost time injury rate 0.24 and total recordable injury rate 0.81 per million hours): IOGP, Safety performance indicators – 2024 data, as reported by JPT on 2 July 2025. Source: JPT · IOGP report page.
- The 200,000-hour basis: National Safety Council, TRIR definition. Source: NSC.
- Driving as the largest historical cause of fatalities: IOGP, Motor vehicle crash data 2008–2024 (report 2024m, 30 July 2025). Source: IOGP. Last reviewed 21 October 2026.
Worked example: 2,000,000 hours to date
The defaults are an example; replace them with your own statistics.
- One lost work day case and no fatality give 1 lost time injury: LTIF = 1 ÷ 2,000,000 × 1,000,000 = 0.50.
- With one medical treatment case there are 2 recordable cases: TRIR = 1.00 per million hours, or 0.20 per 200,000 hours.
- 18 days lost give a severity rate of 9.00 days per million hours.
- 2 crashes in 4,000,000 km give 0.50 crashes per million km.
- Over the last 12 example months, 4 recordable cases in 2,365,000 hours give a rolling TRIR of 1.69, down from 1.86 the month before; 4 months have passed since the last lost time injury.
- With 2,400,000 hours planned for the year and a client target of 1.5, the TRIR ends the year at 0.83 if nothing else happens; each further case adds 0.42, so the second one takes the year above the target.
How to read your results
- A low LTIF with a high TRIR means many injuries are treated without days off; look at what causes them before one becomes a lost time case.
- Small numbers swing: below a few million hours a single case changes the rate a lot. Show the rolling 12-month rate and the count of cases together.
- Rising crash rate with flat crash count means the fleet drove less; with a flat rate and more crashes, it drove more.
- Above target already: the Targets tab shows how many hours without a case bring the rate back, so you can tell the client when to expect it.
How to bring the vehicle numbers down
- Rate drivers on how they drive: speeding, harsh braking and acceleration, seatbelt and night driving, per distance. The Driver Safety Score Calculator (RAG) does it from your IVMS counts.
- Plan every journey outside town: route, rest stops, call-in times and approval, with the Journey Management Plan and the Journey Risk Assessment Tool.
- Report near misses: they show where the next crash will come from. Use the near-miss report.
- Present the month in one file: the Contractor Monthly HSE and IVMS Report puts these rates next to the IVMS results for the client meeting.
Assumptions and limits
The tool counts the cases you enter; what counts as recordable, restricted or lost time follows your client's definitions, which may differ in detail from IOGP's or OSHA's. Rates on a small number of hours are unstable. The year-end view assumes the hours and distance you plan. The tool does not classify incidents for you and is not a regulatory report.