LTIFR Calculation: What It Is, How to Work It Out, and What It Misses
Ask a board what its safety performance looks like and someone will quote the LTIFR. It is one of the most widely reported safety numbers in Australia, and it is easy to misread. This post covers the LTIFR calculation, how it differs from TRIFR, and why a falling number can hide real risk.
What LTIFR means
LTIFR stands for lost time injury frequency rate. It is the number of lost time injuries for every million hours worked over a set period, usually a rolling 12 months.
The standard Australian definition comes from AS 1885.1, the standard for recording and measuring work injury experience. Under it, a lost time injury is a work injury or disease that results in a fatality, a permanent disability, or time lost from work of one day or shift or more.
That last part matters. If a worker is hurt and goes home for the rest of the shift but is back the next day, it is not lost time under this definition. If they miss their next rostered shift, it counts.
The LTIFR formula
LTIFR = (number of lost time injuries ÷ total hours worked) × 1,000,000
Worked example: a site has 3 lost time injuries in a year and its people worked 450,000 hours in that time.
3 ÷ 450,000 × 1,000,000 = 6.67
So the LTIFR is 6.67 lost time injuries per million hours worked. You can check your own figures with our free LTIFR calculator.
Two things trip people up:
- Hours worked means actual hours. Use payroll or timesheet hours, not rostered or budgeted hours. Include overtime. Leave out paid leave.
- Decide on contractors and stick to it. If you count contractor injuries, count contractor hours too. Mix the two and the rate stops meaning anything.
Some overseas organisations multiply by 200,000 instead of 1,000,000 (roughly 100 full-time workers for a year). If you are benchmarking against a US parent company, check which base they use before comparing.
LTIFR vs TRIFR
TRIFR is the total recordable injury frequency rate. It uses the same formula but counts more injuries: lost time injuries plus medical treatment injuries, and in many organisations restricted or alternative duties injuries too.
TRIFR = (number of recordable injuries ÷ total hours worked) × 1,000,000
Because it counts more events, TRIFR is always equal to or higher than LTIFR. Many organisations also report TRIFR, because it captures medical treatment injuries that LTIFR leaves out. There is no single legal definition of a “recordable” injury in Australia, so write yours down and apply it the same way every month.
What is a good LTIFR?
There is no national target. A good LTIFR is one that is trending down for the right reasons and compares fairly with similar work. Comparing a warehouse with an office tells you nothing. If you want an external benchmark, look for data from your industry body or from Safe Work Australia’s published work-related injury statistics, and make sure the definitions match yours.
What LTIFR misses
LTIFR is a lagging measure. It tells you what has already happened, and it has some well-known blind spots:
- Occupational disease. Silicosis, noise-induced hearing loss and many chemical exposure illnesses develop over years. They rarely show up as a lost time injury in the period when the exposure happened.
- Serious incidents that did not hurt anyone. A dropped load that missed a worker by a metre does not move the LTIFR at all.
- Return-to-work pressure. If people are brought back on light duties the next day to protect the number, the LTIFR improves while the risk stays where it was.
- Small numbers. On a site with 40 workers, one injury can swing the rate a long way. Look at the trend over 12 months or more.
That is why the number should sit next to lead indicators: hazard reports closed out, inspections completed, critical controls verified, and corrective actions finished on time. Our guide to learning from incidents covers how to turn incident data into actual change, and the OHS and WHS risk management guide shows where these measures fit in the wider risk process.
A simple monthly routine
- Pull hours worked from payroll for the month.
- Confirm every injury against your written definitions (lost time, medical treatment, recordable).
- Calculate the monthly and rolling 12-month LTIFR and TRIFR.
- Report them with two or three lead indicators, not on their own.
- For every lost time injury, check the corrective actions are assigned and closed.
Need a template for the rest of your safety paperwork? Our free WHS templates and tools are a good place to start.
Tracking it without the spreadsheet
A spreadsheet works fine until injuries, hours and corrective actions live in three different files. Lahebo keeps your incident records, risk register and corrective actions in one place, so the actions behind each incident are easy to find and follow up. If that sounds useful, book a short demo and we will show you how it works.
