Osha Log - Forms For Recording Work-Related Injuries And Illnesses - Us Department Of Labor Page 5
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Calculating Injury and Illness Incidence Rates
What is an incidence rate?
(c) The number of hours all employees actually
various classifications (e.g., by industry, by
An incidence rate is the number of recordable
worked during the year. Refer to OSHA Form
employer size, etc.). You can obtain these
injuries and illnesses occurring among a given
300A and optional worksheet to calculate this
published data at or by calling a
number of full-time workers (usually 100 full-
number.
BLS Regional Office.
time workers) over a given period of time
You can compute the incidence rate for all
(usually one year). To evaluate your firm’s
recordable cases of injuries and illnesses using
injury and illness experience over time or to
the following formula:
compare your firm’s experience with that of
Total number of injuries and illnesses ÷ Number of
your industry as a whole, you need to compute
hours worked by all employees
200,000 hours =
Worksheet
X
your incidence rate. Because a specific number
Total recordable case rate
of workers and a specific period of time are
(The 200,000 figure in the formula represents
involved, these rates can help you identify
Total number of recordable injuries
the number of hours 100 employees working
problems in your workplace and/or progress
and illnesses in your establishment
40 hours per week, 50 weeks per year would
you may have made in preventing work-
Total recordable cases
work, and provides the standard base for
related injuries and illnesses.
incidence rate
calculating incidence rates.)
How do you calculate an incidence
X
200,000
=
You can compute the incidence rate for
rate?
recordable cases involving days away from
You can compute an occupational injury and
work, days of restricted work activity or job
illness incidence rate for all recordable cases or
transfer (DART) using the following formula:
Hours worked by all your employees
for cases that involved days away from work for
(Number of entries in column H + Number of
your firm quickly and easily. The formula
entries in column I) ÷ Number of hours worked by
requires that you follow instructions in
all employees
200,000 hours = DART incidence
X
paragraph (a) below for the total recordable
rate
Total number of recordable injuries
cases or those in paragraph (b) for cases that
and illnesses with a checkmark in
involved days away from work, and for both
You can use the same formula to calculate
column H or column I
rates the instructions in paragraph (c).
incidence rates for other variables such as cases
(a) To find out the total number of recordable
involving restricted work activity (column (I)
DART incidence rate
injuries and illnesses that occurred during the year,
on Form 300A), cases involving skin disorders
X
=
200,000
count the number of line entries on your
(column (M-2) on Form 300A), etc. Just
OSHA Form 300, or refer to the OSHA Form
substitute the appropriate total for these cases,
300A and sum the entries for columns (G), (H),
from Form 300A, into the formula in place of
Hours worked by all your employees
(I), and (J).
the total number of injuries and illnesses.
(b) To find out the number of injuries and
illnesses that involved days away from work, count
What can I compare my incidence
the number of line entries on your OSHA
rate to?
The Bureau of Labor Statistics (BLS) conducts
Form 300 that received a check mark in
a survey of occupational injuries and illnesses
column (H), or refer to the entry for column
each year and publishes incidence rate data by
(H) on the OSHA Form 300A.
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