DART is an acronym for "days away, restricted or transferred." Developed by the Occupational Safety and Health Administration, this safety ratio helps employers determine how many work-related injuries and illnesses led to missed workdays, health-related work restrictions or job transfers within each calendar year. Its main benefit lies helping employers identify workplace safety issues.
Purpose and Function
OSHA uses DART rates as part of its Data Initiative Program. However, while all OSHA-covered businesses must keep track of health and safety information, not all are required to provide DART ratios. In general, only businesses in high-hazard industries that also meet size and injury/illness rate criteria must participate. OSHA uses DART rates along with other statistics to target enforcement and compliance assistance activities.
DART Rate vs. Incident Rates
Calculating a DART Ratio
A DART ratio equation uses 200,000 hours as a benchmark number. This number, which represents the hours 100 employees who work 40 hours per week will work in a 50-week year, allows OSHA and individual employers to make industry-wide comparisons.
The formula is the sum of all missed workdays, health-related work restrictions and job transfers times 200,000, divided by the sum of actual hours worked. For example, if your company had two DART instances over the past year and your employees worked a total of 50,000 hours, your DART rate would be (2*200,000)/50,000, or 8.0 percent.
Internal and Industry-wide Comparisons
The DART rate is useful for internal and industry-wide comparisons, even if OSHA doesn’t require your business to submit the information. Monitor DART rates internally to determine the effectiveness of health and safety programs. The U.S. Department of Labor Bureau of Labor Statistics has an interactive online tool to help you compare your rate with other business in your industry. If your DART rate is higher than the industry average, reviewing your company's safety policies and providing additional training might be necessary.