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.

Methodology, interpretation & sources

Purpose. 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.

How to use the result. Start with source data you can verify, enter values on a consistent unit and time basis, and record the assumptions used. The main inputs on this page include 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., Your Name, Email, Company Name. Re-run the calculation when those assumptions change rather than carrying an old result forward.

Decision use. Use this calculator to standardize a safety-performance indicator from your own verified incident and exposure data. Consistent definitions are essential when comparing sites or time periods.

Limitations. Confirm that the numerator event definition and denominator exposure-hours basis match the reporting framework used by your organization or regulator.

Primary references. Use the current edition/version that applies to your jurisdiction and organization:

Editorial note. Prepared and maintained by Impact Tech Solutions. Editorially updated 28 September 2026. No individual professional credential is claimed on this page; high-consequence, statutory, tax, engineering or health decisions should be independently verified against the current primary source and, where required, a qualified professional.