Understanding DART and OSHA Compliance
DART represents Days Away, Restricted, or Transferred injuries—the cornerstone of OSHA's recordkeeping system. Unlike simple incident counts, the DART rate normalises injury data across organisations of different sizes, enabling meaningful comparisons within your industry.
OSHA, established in 1970 under the Department of Labor, mandates that employers with 10 or more employees maintain records of work-related injuries and illnesses. The DART rate specifically excludes first aid treatment, medical observation, and incidents without restricted or lost work time, focusing instead on injuries with genuine occupational impact.
A high DART rate can trigger:
- Unannounced OSHA inspections examining safety protocols and training programmes
- Reputational damage affecting client contracts and partnerships
- Insurance premium increases and potential coverage complications
- Employee morale and retention challenges
DART Rate Formula
The DART rate standardises injury frequency to a baseline of 200,000 hours (equivalent to 100 full-time employees working 50 weeks annually). This formula enables valid comparison across organisations regardless of workforce size:
DART Rate = (Total DART Incidents × 200,000) ÷ Total Hours Worked
Total DART Incidents— Number of work-related injuries resulting in days away, restricted work, or job transfers during the measurement period (typically one calendar year)Total Hours Worked— Combined hours worked by all employees, excluding vacation, sick leave, and holidays—only hours when employees were actively available for work200,000— Standard hour baseline representing approximately 100 full-time equivalent employees working 2,000 hours annually
Calculating and Interpreting Your DART Rate
To calculate your DART rate accurately, gather two data points from your injury logs and time-tracking systems. First, count all DART incidents from your OSHA 300 form—incidents involving days away from work, restricted work activities, or job reassignments due to workplace injury. Do not include first aid only cases or near-misses.
Second, total all hours worked by eligible employees during the same period. This includes regular hours, overtime, and hours worked by part-time staff, but excludes unpaid leave. Many organisations underestimate this number, inadvertently inflating their DART rate.
Once calculated, compare your rate against Bureau of Labor Statistics data for your industry and company size. A rate below 1.0 indicates strong performance; rates above 2.0 warrant immediate safety intervention. Regional and industry variations are substantial—construction and manufacturing typically exceed administrative and professional services.
Common Pitfalls When Calculating DART Rate
Accurate DART calculation requires careful attention to definitions and data sources.
- Miscounting recordable injuries — Only incidents meeting OSHA's strict definition qualify as DART cases. Medical-only treatments, first aid interventions, and lost-time injuries that don't qualify as recordable all fall outside DART scope. Review OSHA 300 log criteria carefully; when in doubt, consult your safety officer or occupational health adviser.
- Including ineligible hours — Hours must reflect actual work availability. Vacation time, sick leave, holidays, and training conducted off-site shouldn't be counted. Some organisations mistakenly inflate denominator hours by including suspended employees or extended medical leave, artificially lowering their DART rate.
- Ignoring restricted duty injuries — Restricted work cases often receive less attention than days-away incidents, yet both count equally in DART calculations. An employee reassigned to light duty due to back injury contributes a full DART incident—don't undercount these transitions when compiling your total.
- Using incomplete annual data — DART rate comparison requires consistent 12-month periods aligned with your fiscal year or calendar year. Partial-year calculations distort trends and complicate benchmarking. If your organisation experiences seasonal workforce fluctuations, ensure hours and incidents cover the same date range.
Reducing DART Rate Through Workplace Safety
Organisations achieving DART rate reductions typically implement systematic approaches rather than isolated initiatives. Establish a safety committee including worker representatives, conduct thorough accident investigations examining root causes beyond immediate factors, and document corrective actions with measurable timelines.
Regular safety training should address specific workplace hazards relevant to your operations, not generic compliance content. Many organisations find that near-miss reporting systems, when properly communicated to employees, identify hazards before they cause injury. Ergonomic assessments in office and manufacturing settings frequently uncover preventable strain injuries.
Behavioural safety programmes encouraging peer observation and feedback, combined with equipment maintenance schedules and housekeeping protocols, demonstrate measurable DART improvements within 12–24 months. Health surveillance programmes including fitness assessments, vision screening, and hearing tests catch emerging occupational health issues early.