Safety & Workforce worked example

DART Rate with dart cases of 1.5 cases: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop dart cases to 1.5 cases, then walk the calculation through step by step. Calculate DART rate for Safety & Workforce from DART cases and total hours worked, using the OSHA 200,000-hour basis.

The inputs for this scenario

  • DART cases (days away, restricted, or transferred): 1.5 cases (the input this scenario stresses; the baseline uses 3)
  • Total hours worked: 500,000 hr (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: DART rate = DART cases × 200,000 ÷ total hours worked.
  • DART rate works out to 0.6 per 100 workers at these inputs, and this is the headline figure for the scenario.
  • Cases works out to 1.5 cases at these inputs.
  • Hours worked works out to 500,000 hr at these inputs.
  • Full-time equivalents works out to 250 FTE at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where dart cases sits at 3 cases and the headline result is 1.2 per 100 workers, this scenario comes in 50% below the baseline at 0.6 per 100 workers.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to dart cases, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. A single case is counted once even if it involves both days away and later restricted duty, so DART measures case counts, not total days of impact.

Results at a glance

  • DART rate: 0.6 per 100 workers (headline result)
  • Cases: 1.5 cases
  • Hours worked: 500,000 hr
  • Full-time equivalents: 250 FTE

Run it with your numbers

  • To rerun this with your own numbers, open the live DART Rate calculator, set dart cases to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.