Understanding the Lost Time Injury Frequency Rate (LTIFR)
Turn injury and hours-worked data into a rate you can calculate, track and interpret.
Lost Time Injury Frequency Rate measures how often lost time injuries occur relative to hours worked. Use it to support conversations about workplace safety and identify areas for further investigation.
Your Essential Guide to Calculation, Importance, and Workplace Safety
Understanding LTIFR starts with reliable information and consistent reporting. It forms part of your overall injury management system and safety management, helping you organise injury data and explore what changes over time.
Use the rate alongside the details behind each incident, worker feedback and the effectiveness of your risk controls. A single number does not describe the whole safety picture.
The calculation, made clear
The LTIFR Formula and Its Components
The formula expresses lost time injuries per one million hours worked. Use injuries and hours from the same reporting period and worker population.
Lost Time Injury (LTI)
The count of injuries classified as lost time injuries under your reporting framework. Safe Work Australia’s glossary includes occurrences resulting in fatality, permanent disability or at least one day or shift lost from work.
Total Hours Worked
Add actual hours worked for the same reporting period, including ordinary hours and overtime, excluding leave. Keep the population covered by the hours consistent with the injury count.
The Multiplier (1,000,000)
Multiplying by one million expresses the result on a common hours-worked basis. It does not remove differences in work activities, injury definitions or reporting practices.
Try your own numbers
How to Calculate Your LTIFR
Count your lost time injuries, total the hours worked for the same period, then apply the formula. The example below starts with 5 lost time injuries and 2,000,000 hours worked over one year.
This is a frequency rate, not a percentage or a count of days lost.
Determine the Number of Lost Time Injuries
Choose a month, quarter or year. Count the injuries that meet the definition used in your reporting framework.
Calculate the Total Hours Worked
Add ordinary hours and overtime worked during that period, excluding leave. Match the workers covered by the injury count.
Apply the Formula
Multiply the injury count by 1,000,000 and divide by total hours worked. For the example: 5,000,000 ÷ 2,000,000 = 2.5.
Interpret the result
An LTIFR of 2.5 represents 2.5 lost time injuries per million hours worked for the reporting period. It does not mean 2.5% of workers were injured.
Make the number useful
Tracking the Lost Time Injury Frequency Rate
Monitor LTIFR over time and investigate what sits behind changes. A rise or fall may reflect changes in incidents, hours worked, reporting practices or the work being performed. The direction alone does not explain the cause.
Read the rate with its context
- Check the underlying numbers.
Review both injury counts and hours worked, not just the resulting rate. - Keep the method consistent.
Use the same definitions and coverage across reporting periods. - Understand each incident.
Review the circumstances, consequences and follow-up actions.
Keep a broader safety picture
LTIFR is a lagging measure: it describes injuries that have already happened. Review it alongside hazard reports, control checks, corrective actions and worker feedback.
Safe Work Australia notes limitations when LTIFR is used in isolation to measure WHS performance. Avoid treating a low or zero rate as proof that hazards are controlled.
Every statistic represents a person. Keep prevention, recovery and learning central to the discussion.
From measurement to prevention
Preventing Lost Time Injury Frequency
Focus on preventing injuries and improving the conditions behind the numbers. Give workers a voice, act on hazards and check whether changes are working.
Encourage open reporting
Make it easy to raise hazards and near misses without fear of blame. Involve workers in practical solutions and avoid incentives that discourage injury reporting.
Connect training to real work
Use relevant scenarios and interactive practice to build understanding. Review training as tasks, equipment and workforce needs change.
Follow through on actions
Use digital records to organise findings, assign follow-up and review recurring issues. Check whether actions improve risk controls.
Bring your injury information together
Discover our Injury Management System here:
Explore a more organised approach to injury reporting, follow-up and workplace safety information.