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Lost Time Injury Frequency Rate (LTIFR): How to Calculate & Reduce It

June 29, 2021

eC Author

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We’ve been talking a lot recently about the importance of safety reporting – how automation can improve our processes and data collection best practices and how real-time safety visibility can help us enhance safety programs. But it’s time to get a bit more granular and start to examine the types of metrics EHS departments should be tracking, starting with lost time injury frequency rate (LTIFR).

Lost Time Injuries and Lost Time Injury Frequency Rate


When assessing safety performance, one of the most important KPIs to track is lost time injury frequency rate. As any seasoned safety pro can attest, knowing how to calculate and report on LTIFR to your executive team is key.

But before we discuss how to calculate it, let’s start off with a few helpful definitions:

Lost Time Injury

 – any injury sustained by an employee while on the job that prevents them from being able to perform their job for at least one day/shift.

Lost Time Injury Frequency Rate

– the number of lost time injuries that occurred during the reporting period. Most companies choose to calculate LTIFR per 1 million man hours worked.

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Calculating Lost Time Injury Frequency Rate


Measuring your LTIFR is actually easier than you think. The formula is as follows:

([Number of lost time injuries in the reporting period] x 1,000,000) / (Total hours worked in the reporting period).

Now, let’s use an example to further illustrate:

After reviewing and compiling your safety data, you’ve determined that there were six lost time injuries in the past year at your manufacturing company and a total of 2,500,000 hours worked. To calculate your LTIFR, simply plug those numbers into your formula:

(6 x 1,000,000) / 2,500,000

LTIFR = 2.4

And voila! Your company’s LTIFR is 2.4, which means there were 2.4 lost time injuries for every one million man hours worked.  Now that you’ve successfully calculated your LTIFR, you can use that data to benchmark performance and see how you stack up against your industry peers.

RelatedThe Guide to Advanced Safety Analytics and Reporting

Reducing Your LTIFR


EHS departments should be striving for continuous improvement and ultimately – aim to lower LTIFR. Below are 3 strategies safety professionals can try to minimize lost time injuries and improve workplace safety:

Build a Robust Safety Culture

The first thing every EHS leader should do is create a safety culture that promotes worker engagement and participation in safety at every level of the organization. Your culture should focus on employee education and company-wide safety awareness. Tactics that can help with this include introducing safety committees and hosting toolbox talks.

Conduct Regular Hazard Assessments

Before employees begin work on any job, ensure hazard assessments are being conducted and immediately uploaded into your safety management system. This way risks can be documented and controls can be put in place quickly to help prevent incidents from happening.

Invest in Employee Training

Employees should never stop learning while on the job and ongoing training should play a big part in your continuous improvement plan. Regular training sessions both in the classroom and through eLearning can help ensure safety is always top of mind for your team.

Learn More


For more information on how to use workplace safety indicators like LTIFR to your advantage, check out our guide, How to Leverage Your EHS Data to Improve Safety Outcomes.

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