Injury/Illness Incidence Rates

Occupational injury and illness incidence rates are calculated from summary records using the following information:

A. The number of injuries and illnesses.
Count the number of recordable cases from the Log and Summary of Occupational Injuries and Illnesses (form OSHA No. 200) or refer to the Totals line for the yearly total on the Log. The Log and Summary also provides the yearly total for fatalities, injuries and illnesses with lost workdays, and injuries and illnesses without lost workdays.

B. The number of hours all employees actually worked.
Hours worked can be obtained from payroll or other time records. Employee hours worked should not include any non-work time, even though paid, such as vacation, sick leave, holidays, etc. (If actual hours worked are not available, hours worked may be estimated on the basis of scheduled hours or 8 hours per workday.)

An incidence rate of occupational injuries and illnesses [TRC] may be computed using the following formula:

(Number of injuries and illnesses X 200,000)/Employee hours worked = Incidence Rate

Note: The 200,000 in the formula represents the equivalent of 100 employees working 40 hours per week for 50 weeks per year, and provides the standard base for incidence rates. The same formula can be used to compute incidence rates for:

Fatality Rates

The fatality rate measures the number of fatalities per 100,000 worker-years and is calculated by multiplying the number of fatalities by 200,000,000 and dividing by the total hours worked, as follows:

(Number of fatalities X 200,000,000)/Total hours worked = Fatality Rate

Note: The factor of 200,000,000 represents 100,000 workers who each work an estimated 2,000 hours per year.

Property Loss Rates

Property loss rates for the DOE are shown in dollar loss per $10,000 valuation. The calculation of property loss rates are made by summing all DOE damage and/or loss in dollars recorded and dividing by the total estimated property valuation in ten-thousands of dollars for the organizational entity involved, as follows:

(Total DOE dollar loss X 10,000)/Total property valuation = Loss Rate

Property loss rates can be calculated for the total loss or for fire losses and non-fire losses. Since the property valuations are estimated and revised on an annual basis and since the losses are summed over time, the loss rates are considered time dependent. Comparisons should therefore be made against similar time periods.

Vehicle Accident and Loss Rates

The DOE vehicle accident rate is the number of accidents experienced per million vehicle miles and is calculated as follows:

(Number of vehicle accidents X 1,000,000)/Total mileage = Vehicle Accident Rate

The DOE vehicle loss rate represents the dollar loss per 1,000 miles of vehicle travel and is calculated as follows:

(Total dollar loss in vehicle accidents X 1,000)/Total mileage = Vehicle Loss Rate