No. of Accident*(Ref.Value)/(total working man-hours)
Ref. Value=100 (Number of worker) * 45 (number of working hours per week) * 50 (number of working weeks a year)
Result = 225 000
if you accept number of working hours per week=40
result will be = 200 000
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Number of accidents divided by time.
(No. of Reportable Accidents * 100,000) / Total No. of Hours Worked for all Employees = AFR
It depends to the acceptable risk level in your company. Usually AFR=10 is acceptable in most companies.
c=frequency x wavelength