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Lost Time Injury Rate (LTIR)
Formula:
LTIR = ([Total # of Lost Time Injuries] / [Total # Man Worked Hours]) x 200,000
Description:
This number tells you the number of lost time injuries for every 100 workers in a year (Based off the assumption that 100 workers work an average of 200,000 hours in a 12-month period). This metric is only concerned with the number of injuries, not the gravity or severity of the injuries.
Example:
If an organization had two lost time injuries and 100,000 man hours worked during a 12 month period. The LTI would be:
4 = (2 / 100,000) x 200,000
Lost Time Injury Frequency Rate (LTIFR)
Formula:
LTIFR = ([Total # of Lost Time Injuries] x 1,000,000) / [Total # Man Worked Hours]
Description:
This formula gives a picture of the number of lost time injuries occurring in a workplace per 1 million hours worked. Essentially the same calculation as LTIR but rather than calculating per 200,000 worked hours (100 employees per year), it calculates per 1,000,000 hours worked.
Example:
If an organization had two lost time injuries and 100,000 man hours worked during a 12 month period. The LTIFR would be:
20.00 = (2 x 1,000,000)/100,000
Injury severity rate or lost time incident severity rate (LTISR)
Formula:
LTISR = [Total # of lost time]/[Total # of lost time incidents]
Description:
This calculation provides a measurement for average amount of time lost per injury, which can also be thought of as severity per injury.
Example:
If an organization has had 5 injuries in a 12 month period which in total resulted in 12 total lost days, their injury severity rate would be:
2.4 = 12/5
Total Case Incident Rate (TCIR) / Total Recordable Incident Rate (TRIR)
Formula:
TCIR = ([# of OSHA Recordables] x 200,000) / [Total # Man Worked Hours]
Description:
Total Case Incident Rate (TCIR) is defined as the number of work-related injuries per 100 full-time workers during a one-year period. This number can indicate the frequency of OSHA injuries and illnesses over time. It is often also referred to as the OSHA incident rate or total recordable incident rate (TRIR). The TCIR and TRIR are calculated the same way and can be used interchangeably.
Example:
An organization has 2 OSHA recordables and 100,000 worked hours in a year. Their TCIR:
4 = (2 x 200,000)/100,000
Days Away, Restricted, or Transferred (DART) Rate
Formula:
DART = ([# of OSHA Recordables resulting in Days Away; Restricted; Transferred ] x 200,000) / [Total # Man Worked Hours]
Description:
The Days Away, Restricted, or Transferred (DART) Rate is designed to track any OSHA recordable workplace injury or illness that results in time away from work, restricted job roles, or an employee's permanent transfer to a new position. OSHA uses the DART rate to monitor high-risk industries, and they also allow EHS managers to measure the business impact of recordable incidents over time.
Example:
An organization has 4 OSHA recordables that resulted in one or more Days Away; Restricted; Transferred. If their total work hours was 100,000 in the last 12 months then their DART:
8 = (4 x 200,000)/100,000
Days Away From Work (DAFW) Rate
Formula:
DAFW = ([# of OSHA Recordables resulting in Days Away] x 200,000) / [Total # Man Worked Hours]
Description:
Similar to the DART Rate except that it excludes incidents that only resulted in the employee being moved to restricted job duties or permanently transferred to another role.
Example:
An organization has 4 OSHA recordables that resulted in one or more Days Away; and two incidents that only resulted in an employee being Restricted; Transferred. If their total work hours was 100,000 in the last 12 months then their DART:
8 = (4 x 200,000)/100,000
Lost Time Rate (LTR)
Formula:
LT Rate = ([Total Lost Time Hours] / [Total Work Hours]) x 100
Description:
This calculation provides a percentage of hours lost compared to hours worked.
Example:
If an organization had 50 lost time hours and 100,000 man hours worked during a 12 month period. The LTR would be:
0.05% = (50 / 100,000) x 100