Incident Rate Calculator Osha

OSHA Incident Rate Calculator

Calculate your TRIR and DART rates for safety compliance

Include all full-time, part-time, and seasonal hours.

Your Results

TRIR
0.00
Recordable Rate
DART Rate
0.00
Lost Time Rate

Understanding OSHA Incident Rates

The Occupational Safety and Health Administration (OSHA) uses standardized formulas to help businesses evaluate their safety performance. These rates allow companies of different sizes to compare their safety records on an "apples-to-apples" basis by normalizing data to a workforce of 100 full-time employees.

Total Recordable Incident Rate (TRIR)

The TRIR is the most common safety metric. It includes all work-related injuries and illnesses that result in medical treatment beyond first aid, loss of consciousness, restricted work, or days away from work.

The Formula: (Number of Injuries × 200,000) / Total Employee Hours Worked

Days Away, Restricted, or Transferred (DART) Rate

The DART rate specifically measures the severity of injuries. It only counts incidents that resulted in the employee being unable to perform their normal job duties, either by staying home or being moved to "light duty."

The Formula: (Number of DART Cases × 200,000) / Total Employee Hours Worked

Why is the number 200,000 used?

The 200,000 figure is used because it represents the total number of hours 100 employees would work in a full year (100 employees × 40 hours per week × 50 weeks per year). This standardizes the rate so a small business with 10 employees can be compared directly to a corporation with 1,000 employees.

Step-by-Step Calculation Example

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

  • Total Hours Worked: 450,000
  • Total Recordable Incidents: 6
  • DART Cases (included in the 6 incidents): 2

Calculating TRIR:
(6 × 200,000) / 450,000 = 2.67

Calculating DART:
(2 × 200,000) / 450,000 = 0.89

How to Improve Your Safety Rates

  1. Conduct Regular Safety Audits: Identify hazards before they cause injuries.
  2. Invest in Training: Ensure every employee knows the proper safety protocols for their specific tasks.
  3. Encourage Reporting: Focus on a "Safety First" culture where "near misses" are reported and analyzed to prevent future accidents.
  4. Review PPE: Ensure Personal Protective Equipment is up to date and being used correctly.
function calculateOshaRates() { var hours = parseFloat(document.getElementById('totalHours').value); var incidents = parseFloat(document.getElementById('totalIncidents').value); var dart = parseFloat(document.getElementById('dartCases').value); var resultsDiv = document.getElementById('osha-results'); var trirDisplay = document.getElementById('trirValue'); var dartDisplay = document.getElementById('dartValue'); var summaryDisplay = document.getElementById('osha-summary'); if (!hours || hours <= 0) { alert('Please enter a valid number for total hours worked.'); return; } if (isNaN(incidents)) incidents = 0; if (isNaN(dart)) dart = 0; // OSHA Formulas var trir = (incidents * 200000) / hours; var dartRate = (dart * 200000) / hours; // Update UI trirDisplay.innerText = trir.toFixed(2); dartDisplay.innerText = dartRate.toFixed(2); resultsDiv.style.display = 'block'; var statusText = ""; if (trir === 0) { statusText = "Excellent! You have a perfect recordable incident rate of 0.00."; } else if (trir < 3.0) { statusText = "Your incident rate is generally considered within a healthy range for most industries."; } else { statusText = "Your rate is higher than average. Consider reviewing your safety protocols and conducting a hazard assessment."; } summaryDisplay.innerText = statusText + " These calculations are based on the standard OSHA 200,000-hour benchmark."; // Smooth scroll to results resultsDiv.scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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