This is the equivalent of 12/200,000 and effectively normalizes your total recordable injury rate for 100 full-time employees per month instead of 100 employees per year. top of equation) of the TRIR equation instead of 200,000. You would use 16,667 hours in the numerator (i.e. How Do I Calculate TRIR For a Specific Month? If actual work hours are not available for employees paid on commission, by salary, by the mile, etc., hours worked may be estimated on the basis of scheduled hours or 8 hours per workday. In such cases, you also get to include the temporary worker's hours when determining your TRIR. Day-to-day supervision occurs when 'in addition to specifying the output, product or result to be accomplished by the person's work, the employer supervises the details, means, methods and processes by which the work is to be accomplished'. Per OSHA FAQ 31-1, your Company must record the recordable injuries and illnesses of temporary employees if your Company supervises them on a day-to-day basis. Do I Include Injuries, Illnesses and Hours Associated with Temporary Workers? If actual work hours are not available for employees paid on commission, by salary, or by the mile, etc., hours worked may be estimated on the basis of scheduled hours or 8 hours per workday.

'Hours worked' should include hours worked by all employees (include non-employees that your company supervises) over a 12-month period, but not hours such as vacation, sick leave, holidays, etc. Our OSHA Incident Rate Calculator helps you calculate your OSHA Total Recordable Injury Rate (TRIR). Frequently Asked Questions About Injury Rates

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