Injury Rate Calculator

Multiply the number of OSHA recordable cases by 200,000, then divide by the total hours worked by all employees in the same period. The 200,000 hours stand for 100 full-time employees working 40 hours a week for 50 weeks, so the result reads as recordable cases per 100 full-time workers per year.

DART stands for days away, restricted, or transferred. The DART rate counts the recordable cases that involved days away from work, restricted work, or a job transfer, multiplied by 200,000 and divided by total hours worked. On the OSHA 300A summary, those cases are the totals in columns H and I.

The DART rate includes cases with days away from work and cases with restricted work or job transfer. A lost-time or days-away case rate counts only the cases with days away from work, column H on the OSHA 300A. Organizations use the term lost-time rate in different ways, so check which cases are included before comparing numbers.

Because the rate is scaled to 200,000 hours. At 200,000 hours, one case moves a case rate by 1.00. At 50,000 hours, about 25 full-time workers for a year, one case moves it by 4.00. Small workforces see large swings from very few cases, which is why a single year is not a trend.

The Bureau of Labor Statistics publishes incidence rates by industry each year from its Survey of Occupational Injuries and Illnesses, on the same 200,000-hour basis. Compare against the industry that matches your establishment's NAICS code, and the same year.