Lost Time Injury Frequency Rate (LTIFR)
Number of lost-time workplace injuries per million hours worked
What is Lost Time Injury Frequency Rate (LTIFR)?
Lost time injury frequency rate is the number of injuries that cause lost working time for every million hours worked. It shows how often serious enough injuries occur to keep people from work.
It is a widely used safety measure in manufacturing and other industries because it allows fair comparison across different sizes of workforce.
How this KPI is measured
- Function
- Human Resources
- Sub-function
- Wellbeing
- Industry
- Manufacturing
- Type
- Lagging
- Impact
- Risk
- Unit
- rate/M hrs
- Measurement frequency
- Monthly / Quarterly
- Formula
- (Number of lost-time injuries × 1,000,000) / Total hours worked
How to calculate it
Multiply the number of lost-time injuries by 1,000,000, then divide by total hours worked.
For example, if there were 4 lost-time injuries over 2,000,000 hours, the rate is (4 x 1,000,000) / 2,000,000 = 2.
Define a lost-time injury clearly, for example an injury after which the person cannot work the next scheduled shift, and use the same definition each time.
Where it is used
Tracking safety performance
See injury trends.
Benchmarking
Compare with other sites and companies.
Setting safety targets
Drive improvement.
How to improve it
Tips and common mistakes
- Do not create pressure to hide injuries.
- Compare using the same definitions.
- Combine with near miss reporting.
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