LTIFR and TRIFR explained: the safety numbers your board actually wants

What is LTIFR, and why does your board ask for it?

Lost time injury frequency rate (LTIFR) measures how often injuries serious enough to keep someone off work are occurring, expressed as a rate per million hours worked. It's the number that lets a 12-person workshop and a 400-person plant be compared on equal terms, which is exactly why it's usually the first safety figure a board or insurer asks for.

How do you calculate LTIFR?

The standard formula, consistent with the "per million hours worked" convention Safe Work Australia uses for its national injury data, is:

LTIFR = (Number of lost time injuries × 1,000,000) ÷ Total hours worked

Worked example: a manufacturer with 40 employees, each working around 1,800 hours a year, logs 972,000 hours worked in a year. If 3 of those injuries involved time off work, the calculation is:

(3 × 1,000,000) ÷ 972,000 = an LTIFR of roughly 3.1

That means, on this business's own hours base, lost time injuries are occurring at a rate equivalent to about 3.1 per million hours worked — the figure you'd then compare against an industry benchmark.

What actually counts as a "lost time injury"?

This trips more businesses up than the arithmetic does. Under Safe Work Australia's methodology, a lost time claim is an accepted workers' compensation claim that results in one day or shift away from work, a permanent impairment, or a fatality. One day or shift lost is defined as at least 3 hours of time lost, reflecting a typical minimum shift length (Safe Work Australia, Understanding workers' compensation injury frequency rates).

Worth knowing: Safe Work Australia retired its standalone LTIFR calculator in May 2025. LTIFR-equivalent figures are now published through the Workers' Compensation Injury Frequency Rate (WCIFR) dashboard, using "lost time claims" as the closest matching data category (Safe Work Australia). The underlying concept for anyone running their own LTIFR internally hasn't changed.

LTIFR vs TRIFR: what's the difference?

LTIFR only counts injuries that caused time off work. TRIFR (total recordable injury frequency rate) casts a wider net, also including medical-treatment injuries and cases where a worker was put on restricted or modified duties but didn't lose time. TRIFR will always be equal to or higher than LTIFR for the same period, because every lost time injury is also a recordable one, but not the reverse.

Safe Work Australia doesn't publish an official national TRIFR benchmark the way it does for lost time claims, though it notes that data from the ABS Work-Related Injuries Survey can be used to estimate one (Safe Work Australia, Understanding WCIFR). Many manufacturers track TRIFR internally anyway, because it surfaces near misses and minor incidents before they become lost-time claims.

Measure	Counts	Typically used for
LTIFR	Injuries causing 1+ day/shift off work, permanent impairment, or fatality	Board reporting, insurer benchmarking
TRIFR	All of the above, plus medical treatment and restricted-duty cases	Internal early-warning tracking

What's a realistic benchmark for an Australian manufacturer?

Manufacturing runs above the all-industry average on this measure. In 2023-24 (preliminary), the serious claims frequency rate for manufacturing was 9.4 claims per million hours worked, compared with an all-industry average of 6.8. Manufacturing also recorded 14,800 serious workers' compensation claims that year, 10.1% of all serious claims nationally (Safe Work Australia, Key Work Health and Safety Statistics Australia 2025, published October 2025).

On fatalities, manufacturing recorded 7 worker deaths nationally in 2024, a fatality rate of 0.8 per 100,000 workers, which was actually 44% below the industry's own 5-year average of 12.6 deaths a year (same source). Nationally across all industries, there were 188 worker fatalities in 2024, a rate of 1.3 deaths per 100,000 workers, against a 5-year average of 191 deaths and 1.4 per 100,000 (Safe Work Australia, October 2025).

In Victoria, manufacturing is one of five sectors WorkSafe Victoria is targeting for the 2025-26 year, because manufacturing together with health care and social assistance, construction, government and agriculture account for almost 60% of all work-related deaths and accepted injury claims in the state over the past five years (WorkSafe Victoria, 15 August 2025).

Beyond the number: what I'd actually watch on your factory floor

I've sat across the table from plenty of owners who are proud of a flat or falling LTIFR — and I always ask how they're getting there. Sometimes it's genuinely better systems. Sometimes it's a workplace where people have quietly stopped reporting minor injuries because they don't want to be "that guy" who breaks the record.

A single-figure LTIFR, especially in a business under 50 people, can swing wildly on one claim. That's not a reason to ignore it, but it is a reason not to run your whole safety strategy off one lagging number. I'd rather see a manufacturer track LTIFR alongside a couple of leading indicators — toolbox talks actually held versus scheduled, hazards reported and closed out, pre-start checks completed — because those tell you whether the system is working before someone gets hurt, not after.

Under the OHS Act 2004 (Vic), an employer's core duty is to provide and maintain a working environment that is safe and without risks to health, so far as reasonably practicable (OHS Act 2004 (Vic), s21). LTIFR itself isn't a figure the Act requires you to calculate — it's a management tool, not a compliance test — but a rising or consistently high rate is exactly the kind of evidence a regulator, insurer, or plaintiff's lawyer will go looking for if something goes wrong.

If you're not confident your current numbers reflect what's really happening on your floor, a second set of eyes helps. Ardmor runs on-site assessments for Victorian manufacturers to pressure-test what's actually being reported, tracked and acted on — you can book a site assessment if that would be useful.

FAQ

Is calculating LTIFR a legal requirement under the OHS Act 2004 (Vic)? No. The OHS Act 2004 (Vic) requires employers to provide and maintain a safe working environment so far as reasonably practicable, but it doesn't prescribe LTIFR as a specific compliance measure. It's a widely used management and benchmarking figure rather than a statutory reporting obligation.

How often should a manufacturer recalculate LTIFR? Most businesses track it monthly and report a rolling 12-month figure, since a single month's number in a small workforce can be skewed by one incident. Safe Work Australia itself recommends longer averaging periods, such as five years, for smaller organisations to reduce volatility in benchmark comparisons.

Does a low LTIFR mean our workplace is actually safe? Not necessarily on its own. LTIFR only captures injuries serious enough to cause time off work and reported as workers' compensation claims, so under-reporting can flatter the number. It's best read alongside leading indicators like hazard reports, toolbox talk completion and corrective action close-out rates.

This article is general information for Victorian manufacturers, not legal advice. Last updated: 10 August 2026.