LTIR Calculator

LTIR (Lost Time Incident Rate) is the number of work-related injuries and illnesses that resulted in at least one day away from work for every 200,000 hours worked, which is roughly 100 full-time employees for one year. It is calculated as lost time cases multiplied by 200,000, divided by total hours worked.

In U.S. OSHA recordkeeping terms, a lost time incident is a recordable injury or illness that kept the employee away from work for at least one day after the day of the injury, as recorded in column H of the OSHA 300 Log. The day of the injury itself is not counted. Many international and oil and gas definitions, such as those used by IOGP, also count fatalities and permanent total disabilities, so confirm which definition a customer or benchmark uses before comparing rates.

All three use the same 200,000-hour formula but count different cases. TRIR counts every OSHA recordable case, the DART rate counts cases with days away, restricted work, or job transfer, and LTIR counts only cases with days away. Using the same definitions and hours, LTIR is always less than or equal to DART, and DART is less than or equal to TRIR.

A good LTIR is one below the rate for your industry and trending down year over year. The Bureau of Labor Statistics does not publish a statistic called LTIR, but it does publish a days-away-from-work (DAFW) case rate by industry, which is the closest published equivalent on the 200,000-hour basis. Because lost time cases are relatively rare, small sites should look at multi-year trends rather than a single year.

LTIFR (Lost Time Injury Frequency Rate) uses 1,000,000 hours instead of 200,000 hours as the multiplier, so an LTIFR is five times the LTIR for the same data. LTIFR is common in Australia, the United Kingdom, and international oil and gas reporting, while U.S. companies typically use the 200,000-hour basis.

Include all hours actually worked by employees and by non-employees you supervise day to day, such as temporary workers, during the period. Do not include vacation, sick leave, holidays, or other paid time off. If actual hours are not tracked for salaried or commissioned employees, estimate them from scheduled hours or 8 hours per workday.