Incident Rate (IR): Use the number from the previous year for the calculation below, which is a nationally recognized measure of safety that equalizes accident rates for all firm sizes.
N: number of lost workday cases plus recordable incidents and modified duty for both injuries and illnesses. This number should be the sum of the check marks in columns H, I and J of your previous year’s OSHA 300 log.
WH: number of work hours for the firm in the calendar year included all on your payroll: hourly, non-hourly, overtime.
(N x 200,000) / WH = IR