DART Rate Calculator
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The DART Rate Calculator enables safety managers, HR professionals, and OSHA compliance officers to calculate their organization’s Days Away, Restricted, or Transferred (DART) rate accurately. By tracking workplace injuries and illnesses that result in lost workdays, job transfer, or restricted duties per 100 full-time employees, companies can benchmark safety performance against industry standards.
The DART Rate Formula
The DART rate is standardized by OSHA using a baseline of 100 full-time equivalent (FTE) workers working 200,000 hours total per year (100 workers × 40 hours/week × 50 weeks):
DART Rate = (Total DART Incidents × 200,000) / Total Hours Worked by All Employees
Where:
- Total DART Incidents: The total number of OSHA-recordable injuries or illnesses resulting in days away from work, restricted work activity, or job transfer (OSHA Form 300 columns H + I).
- 200,000: The standard base benchmark representing 100 full-time employees working 40 hours per week for 50 weeks per year.
- Total Hours Worked: Actual total hours worked by all employees during the evaluation period (excluding paid time off, sick leave, or vacation).
DART Rate Industry Benchmarks
Compare your company’s DART safety performance against general industry risk categories:
| DART Rate Range | Safety Rating | Compliance Status & Action |
|---|---|---|
| 0.0 – 1.0 | Excellent | Significantly below national industry averages; top safety standards. |
| 1.1 – 2.5 | Average / Acceptable | Typical for moderate-risk commercial or manufacturing sectors. |
| 2.6 – 4.0 | Elevated Risk | Requires safety protocol reviews and ergonomics/hazard audits. |
| 4.1+ | High Hazard / Action Needed | High risk of targeted OSHA inspections; immediate intervention required. |
Step-by-Step DART Rate Calculation Example
Here is a practical example demonstrating how a manufacturing facility calculates its annual DART safety score:
- Count DART Cases: A plant records 6 cases involving lost workdays and 4 cases involving job transfers (Total DART Incidents = 10).
- Gather Total Employee Hours: The facility employed 250 workers logging a total of 500,000 actual hours worked in the calendar year.
- Multiply Incidents by Base Factor:
10 × 200,000 = 2,000,000. - Divide by Total Hours:
2,000,000 / 500,000 = 4.0. - Result: The facility’s DART rate is 4.0 incidents per 100 FTE employees.
Frequently Asked Questions
What is the difference between TRIR and DART rate?
Total Recordable Incident Rate (TRIR) counts all recordable workplace injuries and illnesses, regardless of severity. DART rate only counts serious incidents that resulted in days away from work, restricted duty, or job transfer.
Which OSHA form columns are included in the DART calculation?
The DART rate specifically uses the numbers from Column H (Days away from work) and Column I (Job transfer or restriction) on OSHA Form 300.
Why is 200,000 used in the DART formula?
The number 200,000 represents the total hours worked by 100 full-time employees working 40 hours per week for 50 weeks per year, providing a standardized metric across companies of all sizes.
How does a high DART rate impact a business?
A high DART rate increases workers’ compensation insurance premiums, triggers potential OSHA inspections, impairs eligibility for government/commercial contracts, and damages workplace morale.