Days Away Restricted or Transferred (DART) Rate Calculator
The DART rate measures the number of recordable workplace injuries and illnesses that resulted in days away from work, restricted work activity, or job transfers per 100 full-time equivalent (FTE) employees.
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Formula
DART Rate = (Naway + Nrestricted + Ntransferred) × 200,000 ÷ H
- Naway — Number of OSHA recordable cases involving days away from work
- Nrestricted — Number of OSHA recordable cases involving restricted work activity
- Ntransferred — Number of OSHA recordable cases involving job transfers
- 200,000 — Base hours representing 100 full-time employees working 40 hrs/week × 50 weeks/year
- H — Total hours worked by all employees during the period
Assumptions & References
- The 200,000-hour constant represents 100 full-time equivalent employees working 40 hours per week for 50 weeks per year.
- Only OSHA-recordable cases (as defined under 29 CFR Part 1904) that resulted in days away, restricted activity, or job transfer are counted.
- Hours worked should include all employees (full-time, part-time, temporary, seasonal) but exclude vacation, sick leave, and holidays.
- The DART rate is typically calculated on an annual basis but can be applied to any defined period.
- The U.S. Bureau of Labor Statistics (BLS) national average DART rate for private industry is approximately 1.5 (varies by year and industry sector).
- Source: OSHA Recordkeeping Rule — 29 CFR Part 1904; BLS Survey of Occupational Injuries and Illnesses (SOII).
- DART is a lagging indicator; it reflects past performance and should be used alongside leading indicators for a complete safety picture.