DART Rate Calculator

Calculate your DART Rate (Days Away, Restricted, or Transferred) — the rate of OSHA-recordable cases resulting in days away from work, job restriction, or job transfer, standardized against total hours worked.

Reporting Standard / Base Hours DART is an OSHA recordkeeping metric, standardized per 200,000 hours by convention.

Number of DART Cases OSHA-recordable cases involving Days Away, Restricted work activity, or job Transfer (from OSHA Form 300).

Total Hours Worked Total exposure hours by all employees in the same period.

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DART Cases per Standardized Hours

Formula Reference

DART Rate = (Number of DART Cases × Base Hours) ÷ Total Hours Worked

OSHA-style (standard)	200,000 hrs base (100 FTE / yr)
Per Million Man-Hours	1,000,000 hrs base

What Counts as a DART Case?

DART = Days Away, Restricted, or Transferred. A DART case is any OSHA-recordable injury or illness that results in one or more of: (1) days away from work, (2) restricted work activity (light duty), or (3) job transfer to a different position. It is a subset of your Total Recordable Incident Rate (TRIR) cases — a case that only requires medical treatment beyond first aid, with no days away, restriction, or transfer, is recordable (counts in TRIR) but is not a DART case.

Calculations follow standard OSHA DART rate methodology (cases × 200,000 ÷ total hours worked), as used in OSHA Form 300A annual summaries and reported to BLS. Results are for guidance only — always verify against your official OSHA 300/300A recordkeeping, and compare against your specific NAICS industry code's published BLS average rather than a generic benchmark, since acceptable DART rates vary significantly by industry. For customized calculators tailored to your organization, please contact Impact Tech Solutions.