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LTIFR Calculator

Calculate Lost Time Injury Frequency Rate (LTIFR). Enter injuries and hours worked.

What is LTIFR?

LTIFR (Lost Time Injury Frequency Rate) is the most widely reported lagging safety performance indicator across Australian, UK, and mining/construction industries worldwide. It quantifies how often lost-time injuries occur relative to the hours worked in an organisation. A "lost-time injury" is any work-related injury or illness that results in the affected worker being absent from work for at least one complete shift or working day beyond the day of injury.

LTIFR is used by safety managers, WHS officers, executive leadership, and government regulators to benchmark safety performance, track trends over time, compare across industry peers, and demonstrate compliance with reporting obligations.

The LTIFR Formula

LTIFR = (Number of Lost-Time Injuries × Base) ÷ Total Hours Worked

Where Base = 1,000,000 (Australia / UK / most international frameworks)
          or 200,000  (OSHA / US 100 FTE equivalent)

Severity Rate = (Total Days Lost × Base) ÷ Total Hours Worked

Example: A construction company with 250 employees working 48 hours/week for 50 weeks accumulates 600,000 hours. If they experience 4 LTIs, their LTIFR is (4 × 1,000,000) ÷ 600,000 = 6.67 per million hours.

How to Use This Calculator

  • Enter the number of lost-time injuries for the reporting period
  • Choose to enter hours directly or calculate from workforce size × hours/week × weeks
  • Select the base: 1,000,000 (AU/UK default), 200,000 (OSHA), or a custom value
  • Optionally enter total days lost to also calculate the severity rate
  • Click Calculate to see LTIFR, severity rate, and industry context

What is a Good LTIFR?

There is no single "good" LTIFR — it must be compared against the relevant industry benchmark and your own trend over time. As approximate illustrative reference points for Australian industries (these change annually and should be verified against the latest Safe Work Australia National Injury Data):

  • All industries: approximately 1.8 per million hours
  • Construction: approximately 4.5 per million hours
  • Mining: approximately 2.0 per million hours
  • Healthcare and social assistance: approximately 3.0 per million hours
  • World-class performance: LTIFR below 1.0 per million hours

Downward trends in LTIFR over consecutive reporting periods are generally more meaningful than the absolute figure, since one serious incident can dramatically change the rate for a small organisation.

LTIFR vs TRIFR — Which Should You Report?

LTIFR captures only lost-time injuries and therefore represents the most serious end of the injury spectrum. TRIFR (Total Recordable Injury Frequency Rate) additionally includes medical treatment injuries and restricted work injuries — providing a broader view of the organisation's injury burden. Most modern WHS frameworks, including Safe Work Australia's national reporting, recommend tracking both. LTIFR is typically used for external benchmarking and regulatory reporting, while TRIFR is more sensitive to early changes in injury trends.

Limitations of LTIFR as a Safety Metric

LTIFR is a lagging indicator — it tells you what already happened, not what might happen next. Common limitations include: small organisations experience high statistical volatility (one injury can double the rate); it does not capture near-misses or hazardous conditions; different classification practices between organisations affect comparability; and a focus on LTIFR reduction can inadvertently create pressure on workers not to report injuries. Complement LTIFR with leading indicators such as hazard reports, near-miss reports, safety observations, and corrective action closure rates.

よくある質問

What is LTIFR?
LTIFR (Lost Time Injury Frequency Rate) is the number of lost-time injuries per million (or 200,000) hours worked. It is the most widely reported lagging safety indicator in Australia, the UK, and mining/construction industries worldwide. A 'lost-time injury' is any work-related injury or illness that causes an employee to be absent from work for at least one full day or shift beyond the day of the injury.
How is LTIFR calculated?
LTIFR = (Number of Lost-Time Injuries × Base) ÷ Total Hours Worked. The base is 1,000,000 in Australia and the UK, and 200,000 (equivalent to 100 full-time employees working one year) in the OSHA system. Example: 3 LTIs over 500,000 hours gives an LTIFR of 3 × 1,000,000 ÷ 500,000 = 6.0.
What is a good LTIFR benchmark?
Benchmarks vary significantly by industry. As approximate illustrative figures: Australian all-industry average is around 1.8, construction around 4.5, and mining around 2.0 per million hours. These figures change annually — always refer to the most recent Safe Work Australia Statistical Report or your industry association. World-class safety performance is typically LTIFR below 1.0.
What is the difference between LTIFR and TRIFR?
LTIFR counts only injuries that result in at least one full shift of lost time. TRIFR (Total Recordable Injury Frequency Rate) counts all recordable injuries — fatalities, lost-time injuries, medical treatment injuries, and restricted work injuries. TRIFR is always equal to or higher than LTIFR and is considered a more comprehensive measure of workplace injury.
What counts as a lost-time injury?
A lost-time injury (LTI) is any work-related injury or disease that results in the person being absent from work for one or more complete shifts beyond the day or shift on which the injury occurred. It includes fatalities. It does not include first-aid-only cases or injuries where the person returns to work (even modified duties) the next scheduled shift.
What is the difference between frequency rate and severity rate?
Frequency rate measures how often injuries occur (number of LTIs per million hours worked). Severity rate measures how serious they are (working days lost per million hours worked). A high severity rate with a low frequency rate suggests fewer but more serious injuries. Both metrics together give a more complete picture of workplace safety performance.

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