How to calculate Lost Time Injury Frequency (LTIF)

Lost Time Injury Frequency (LTIF)

The LTIF is an important component of a company’s Health & Safety Statistics. Knowing how to calculate it as a Safety Professional is also very important mostly for the sake of knowing how to do – you might be required to report it the boss every so often. LTIF is short for Lost Time Injury Frequency. This term is used to describe the number of lost time injuries (LTI) in a workplace per 1,000,000 man hours worked. Some people calculate LTI per 100,000 man hours.

Lost time means that the injury that occured resulted in the involved person or persons staying away from work for more than 24 hours. It could also be that the injury resulted in death or a disability – this is also lost time.

Lost time injury frequency

Calculating LTIF

To get started with calculating LTIF, you need to first know the Total Man Hours in your company. To calculate Total Man Hours in a month, you need to take the total number of all your employees and multiply it by the number of hours each of them work and the number of days worked. 

Formula: Total Man Hours worked = Total No of employees X No of hours worked X No of worked days

For example, in ABC & Sons, they have 58 employees who work 7.5 hours a day, 22 days a month, 264 days a year.

ABC & Sons Total Man Hours for a month is –
Total Man Hours worked = Total No of employees X No of hours worked X No of worked days
Total Man Hours at ABC & Sons = 58 X 7.5 X 264
Total man hours at ABC & Sons = 114,840

You can calculate for every month, quarter or every year depending on your organisation.

Once you have the Total Man Hours, you can then go on to calculate the LTIF

Formula for LTIF Lost Time Injury Frequency = No of Injuries X 100,000 divided by No of hours worked

Some people prefer to use 100,000 while others like to use a million but be sure to stick with whatever you decide to use throughout the process month in month out so that the result won’t appear to have too many discrepancies. I am using 100,000 because it is realistic given the total man hours I have just calculated for ABC & Sons. Between, you do know ABC & Sons is a fictional company?

For example, at ABC & Sons, we have established that their Total Man Hours in a year is 114,840. But this month, they had 2 accidents and 5 injured which resulted in 23 lost days. When calculating LTIF, you don’t take up the 5 (injured) or 23 (lost days) as number of injuries but rather the 2 times that the injury (the accidents) occured! 

So their LTIF =  No of Injuries X 100,000 divided by No of hours 

LTIF = 2 X 100,000 divided by 114,840
LTIF = 1.74

This means that ABC & Sons experienced 1.74 LTIs for every 100,000 hours worked over the past year.

You do get it, right?

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