OSHA DART Safety Incident Rate Calculator
The OSHA DART (Days Away, Restricted, or Transferred) rate measures workplace injuries and illnesses severe enough to result in lost work days, job restrictions, or job transfers per 100 full-time...
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📐 Formula
💡 Practical Example
3 DART cases and 5 total recordable cases over 200,000 employee hours worked (100 FTEs): DART Rate = / 200,000 = 3.00 cases per 100 full-time workers. TRIR Rate = / 200,000 = 5.00 cases per 100 full-time workers.
📖 About OSHA DART Safety Incident Rate Calculator
The OSHA DART (Days Away, Restricted, or Transferred) rate measures workplace injuries and illnesses severe enough to result in lost work days, job restrictions, or job transfers per 100 full-time equivalent employees.
To use the OSHA DART Safety Incident Rate Calculator, enter your DART Cases Count (Days Away, Restricted, or Transferred), Total Employee Hours Worked in Year, Total OSHA Recordable Cases (TRC). The calculator instantly computes OSHA DART Incident Rate, Total Recordable Incident Rate (TRIR) and more. Results update in real time as you change any input — no submit button needed.
How to Use This Calculator
Enter your DART Cases Count (Days Away, Restricted, or Transferred) (e.g. 3 in cases), Total Employee Hours Worked in Year (e.g. 200000 in hours), and Total OSHA Recordable Cases (TRC) (e.g. 5 in cases). Results update instantly as you type — adjust any value to compare scenarios.
The Formula
OSHA DART Rate = (Total DART Cases × 200,000 Hours) ÷ Total Employee Hours Worked
TRIR Rate = (Total Recordable Cases × 200,000 Hours) ÷ Total Employee Hours Worked
Full-Time Equivalents (FTE) = Total Hours Worked ÷ 2,000 Hours
Worked Example
3 DART cases and 5 total recordable cases over 200,000 employee hours worked (100 FTEs):
DART Rate = / 200,000 = 3.00 cases per 100 full-time workers.
TRIR Rate = / 200,000 = 5.00 cases per 100 full-time workers.
Understanding Your Result
Evaluate your result in the context of your specific use case and relevant industry standards or reference values. A single calculated result is a starting point — test two to three scenarios to understand how sensitive the outcome is to your key input assumptions. For high-stakes decisions, verify your result against a secondary source or subject-matter expert before acting.
💡 Mathematical Rigor & Applied Context
- This calculator applies exact mathematical definitions following conventions established by NIST and international standards bodies.
- Rounding errors accumulate across multi-step calculations. For precision-critical work, maintain extra significant figures through all intermediate steps.
- Many mathematical concepts have multiple valid formulations — if a result seems unexpected, verify which convention or definition applies to your context.
- Dimensional analysis (unit tracking) is the fastest way to catch formula errors. Every term in an equation must have consistent, compatible units.
- Numerical methods used in digital calculators introduce floating-point precision limits (~15 significant digits for IEEE 754 double precision).
- For statistical and probabilistic calculations, always specify whether you are working with population parameters or sample statistics — formulas differ.
- Visualizing a problem geometrically or testing with known boundary values (zero, infinity, negative) reveals hidden errors faster than algebraic checking.
- When in doubt, validate your result against a simplified hand calculation or a published worked example from a textbook or standards document.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.