Osha Rate Calculation

OSHA Rate Calculator (TRIR & DART)

Include all cases involving medical treatment beyond first aid, lost days, or restricted duties.

Incidents involving Days Away, Restricted activity, or Job Transfer.

The actual total number of hours worked by all employees during the period.

TRIR (Total Recordable Incident Rate)

0.00

DART Rate

0.00

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Understanding OSHA Safety Rates

Workplace safety is measured by several key performance indicators (KPIs) established by the Occupational Safety and Health Administration (OSHA). The two most critical metrics for assessing a company's safety performance are the Total Recordable Incident Rate (TRIR) and the Days Away, Restricted, or Transferred (DART) Rate.

What is TRIR (Total Recordable Incident Rate)?

The TRIR is a mathematical formula used by OSHA to evaluate a company's safety performance compared to previous years or to other companies within the same industry. It represents the number of work-related injuries and illnesses per 100 full-time employees over a one-year period.

What is the DART Rate?

The DART rate is more specific than TRIR. It focuses on the more severe workplace injuries—those that result in employees having to take time off work, being placed on restricted duty, or being transferred to another job task due to their injury. A high DART rate often indicates more severe safety issues than a high TRIR alone.

The Calculation Formula

The calculation is based on the "standard" of 100 employees working 40 hours per week, 50 weeks per year (totaling 200,000 hours). The formulas are:

• TRIR = (Number of Recordable Incidents × 200,000) / Total Hours Worked
• DART = (Number of DART Incidents × 200,000) / Total Hours Worked

Practical Example

Imagine a manufacturing plant with the following data for a calendar year:

• Total Hours Worked: 450,000 hours
• Recordable Incidents: 5
• DART Incidents: 2

Calculation:

TRIR = (5 × 200,000) / 450,000 = 2.22

DART = (2 × 200,000) / 450,000 = 0.89

This means for every 100 employees, roughly 2.22 sustained a recordable injury, and 0.89 sustained an injury serious enough to require time away or restricted duty.

Why These Rates Matter

Low TRIR and DART rates are vital for several reasons beyond worker safety:

• Insurance Premiums: Lower rates often lead to lower worker's compensation insurance costs.
• Contracting: Many government agencies and large corporations require companies to have a TRIR below a certain threshold to bid on projects.
• OSHA Inspections: Consistently high rates may trigger programmed OSHA inspections and increased regulatory scrutiny.