DART Rate Calculator

Calculate Your OSHA DART Workplace Safety Incident Rate

The DART Rate (Days Away, Restricted, or Transferred) is an OSHA safety metric used to quantify serious workplace injuries and illnesses that result in lost work time, job duty restrictions, or employee reassignment. This metric standardizes safety reporting across organizations of different sizes by calculating incidents per 100 full-time workers.

DART Rate Calculation Formula

OSHA calculates the DART rate using the standard equation:

$$\text{DART Rate} = \frac{N_{\text{DART}} \times 200,000}{H_{\text{total}}}$$

Where $N_{\text{DART}}$ is the total number of injuries and illnesses involving days away from work, job transfer, or restriction, $H_{\text{total}}$ is the total employee hours worked in the accounting period, and $200,000$ represents the standard benchmark hours worked by 100 full-time employees working 40 hours per week for 50 weeks.

Why the DART Rate Matters

Monitoring your DART rate helps safety directors, HR managers, and corporate leadership:

• Identify workplace hazards requiring ergonomic or process safety improvements.
• Maintain compliance with OSHA Form 300A annual summary reporting.
• Evaluate workers compensation liability and insurance risk premiums.
• Benchmark workplace safety performance against industry national averages.

Related Safety and HR Metrics

Manage organizational performance with our Absence Percentage Calculator, or track workforce metrics using our Attrition Rate Calculator.