AUDIT KECELAKAAN
MATERI PENDUKUNG – PERTEMUAN 13 - B
OSHA Incidental Rate
The OSHA incidence rate (IR) is a measure of recordable occupational
injuries. It is expressed as the ratio of the number of recordable injuries to
the total man-hours worked, multiplied by 200,000 man-hours (100
employees, 40 hours a week, 50 weeks a year). This relationship can be
expressed as follow:
IR 
I (200,000)
H
where:
IR
= OSHA incidence rate
I
= Number of injuries
H
= Man-hours worked for the number of injuries, I
For example, if an organization experiences 10 recordable occupational
injuries in a 100,000 man-hours period, its OSHA incidence rate is:
IR 
(10)( 200,000)
= 20 lost time injuries per 100 employees annually
100,000
Accident Severity Rate
The accident severity rate is defined as the number of lost days due to
occupational injuries per specific number of annual worker-hours. The
standard for accident severity rate is also 200,000 man-hours worked. The
accident severity rate can be calculated from the following expression:
S
( LD)( 200,000)
H
where:
S
= Acident severity rate
LD
= Number of lost days due to injuries
H
= Total man-hours worked
For example, the accident severity rate for an organization that employs 50
workers with 100 days of lost time in one year can be calculated as follows:
S
(100)( 200,000)
= 200 lost days per OSHA standard for 100
(50)( 40)(50)
employees