Injury Frequency Rate (IFR)

Last updated: February 14, 2018

What Does Injury Frequency Rate (IFR) Mean?

An injury frequency rate (IFR) is the number of injuries sustained for every one million employee hours worked. The calculation involves multiplying the number of injuries in a period by one million hours and dividing it by the number of labor hours worked at the company. This metric is designed to demonstrate the probability of how high or low the chances might be of sustaining a reportable injury at work. It is often used by companies as a measure of injury prevention practices.

Injury frequency rate is also referred to as Lost Time Injury Frequency Rate (LTIFR) as well as Accident Frequency Rate (AFR).

Number of injuries x 1Million/number of hours worked = Injury Frequency Rate


WorkplaceTesting Explains Injury Frequency Rate (IFR)

The injury frequency rate (IFR) is a way of measuring how often injuries occur in the workplace in a way that can be compared with other worksites or other jobs within the workplace in context. Using the IFR is a way to help employers obtain baseline safety information and measure improvements or problems in the future. High risk trades advocate this metric to clients, employees, and the public as a quantifiable manifestation of their pledge to safety. The lower the number, the less risk there is of being injured at work.



Lost Time Injury Frequency Rate, Accident Frequency Rate

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