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The “Lost Workday Rate” and “Severity Rate” are primarily used only in
larger companies that have a larger number of Lost Time Cases.
The newest incident rate type is called the DART or “Days Away/Restricted or
Transfer Rate”.

OSHA has established specific mathematic calculations that enable any
company to report their recordable incident rates, lost time rates and severity rates, so
that they are comparable across any industry or group. The standard base rate of
calculation is based on a rate of 200,000 labor hours. This number equates to 100
employees, who work 40 hours per week, and who work 50 weeks per year. Using
this standardized base rate, any company can calculate their rate(s) and get a
percentage per 100 employees.

1) Recordable Incident Rate (IR Rate)
Total Incident Rate – a mathematical calculation that describes the number of
recordable incident that a company experiences per 100 full-time employees in any
given time frame.
Recordable Incidents – Recordable incidents include all work-related deaths,
illnesses, and injuries that result in a loss of consciousness, restriction of work or
motion, permanent transfer to another job within the company, or that require some
type of medical treatment or first-aid.
Recordable incidents are incidents that resulted from exposure or event in the
workplace and that required some type of medical treatment or first-aid.
Incidents are not recordable if the employee has symptoms that merely
surfaced while at work but were the result of a non-work related event or exposure.
For example, a cold or an infection from a cut that was received at home is not
recordable. Additionally, “activities of daily living” are not normally recordable. For
example, a heart attack is generally not considered a recordable injury, unless it was
caused by a singular event or exposure at work that caused the attack.
The Recordable Incident Rate (or Incident Rate) is calculated by multiplying
the number of recordable cases by 200000, and then dividing that number by the
number of labor hours at the company.
I  200 000
RI Rate  RI , ) 1 . 1 (
Т

where IRI - number of recordable cases;
T - number of employee labor hours worked.
For example, a company has 17 full-time employees and 3 part-time employees
that each work 20 hours per week. This equates to 37000 labor hours each year. If the
company experienced 2 recordable injuries, then the formula works like this:
2 200 000
RI Rate   10 , 81 .
37 000

What is now known is that for every 100 employees, 10,81 employees have
been involved in a recordable injury or illness.

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