How to Calculate Your Total Recordable Incident Rate (TRIR)

How to Calculate Your Total Recordable Incident Rate (TRIR) | IncidentVault
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📊 TRIR Calculation Guide

How to Calculate Your Total Recordable Incident Rate (TRIR)

TRIR — Total Recordable Incident Rate — is the universal language of workplace safety performance. Every OSHA-covered employer calculates it. Insurance underwriters use it to price workers’ compensation. Contractors are required to disclose it to bid on certain projects. And safety managers use it to measure whether their programs are actually working.

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⚡ Key Takeaway

TRIR measures how many OSHA-recordable injuries and illnesses occur per 100 full-time equivalent employees per year. The formula is straightforward: (Number of recordable cases × 200,000) ÷ Total employee hours worked. IncidentVault tracks TRIR automatically from incident data and hours-worked inputs — giving safety managers current TRIR without a manual calculation every time the metric is needed.

Formula
(Recordable cases × 200,000) ÷ Hours worked = TRIR
200,000
The normalizing constant — equivalent to 100 full-time employees working 40 hrs/week, 50 weeks/year
Benchmark
Compare your TRIR to BLS industry averages — published annually for every NAICS code

The TRIR Formula — Step by Step

TRIR = (N × 200,000) ÷ H

Where: N = Number of OSHA recordable injuries and illnesses in the period · H = Total hours worked by all employees during the period · 200,000 = Base hours for 100 full-time employees (100 employees × 2,000 hours/year)

Step 1: Count Your OSHA Recordable Cases

Count every work-related injury or illness that meets OSHA’s recording criteria during the period: any case resulting in days away from work, restricted work or job transfer, medical treatment beyond first aid, loss of consciousness, or diagnosis of a significant injury/illness by a licensed healthcare professional. Do not count first-aid-only cases. Count each case once, even if the employee was involved in multiple work-related injuries during the period.

Step 2: Calculate Total Hours Worked

Total all actual hours worked by all employees — including salaried, hourly, part-time, temporary, and seasonal employees. Do not include vacation, sick leave, holidays, or other non-worked hours — use actual hours worked only. Many payroll systems can generate this figure directly; for organizations without automated tracking, an estimate based on headcount × average weekly hours × weeks in the period is acceptable.

Step 3: Apply the Formula

Example Calculation:

  • Period: 12 months (January–December)
  • OSHA recordable cases: 8
  • Total hours worked by all employees: 425,000
  • TRIR = (8 × 200,000) ÷ 425,000 = 1,600,000 ÷ 425,000 = 3.76

This means: for every 100 full-time equivalent employees, this organization experienced 3.76 recordable incidents per year. Whether 3.76 is good or poor depends entirely on the industry benchmark for this employer’s NAICS code.

Comparing Your TRIR to Industry Benchmarks

The Bureau of Labor Statistics (BLS) publishes annual injury and illness rates by industry — the most reliable TRIR benchmark data available. BLS publishes TRIR (they call it the “total recordable cases” rate) for every detailed NAICS industry code, allowing you to compare your rate to employers of similar size in your specific industry.

Key benchmark reference points for context (illustrative — check current BLS data for your NAICS code):

  • Private industry average: approximately 2.7 (varies year to year)
  • Healthcare and social assistance: typically 4–6 (high physical demand workforce)
  • Retail trade: typically 3–4
  • Manufacturing: varies widely by subsector, 2–8
  • Finance and insurance: approximately 0.5–1.5 (low physical hazard)

A TRIR below your industry average means your safety performance is better than peers. A TRIR above your industry average means you have improvement opportunity relative to comparable employers — and that your workers’ compensation experience modification rate is likely above average as well.

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DART Rate

Days Away, Restricted, or Transferred Rate. Calculated the same way as TRIR but counts only cases that resulted in days away from work, restricted duty, or job transfer — excluding medical-treatment-only cases. DART = (DART cases × 200,000) ÷ Total hours worked. DART is more sensitive to serious injuries than TRIR because it excludes minor injuries that required only medical treatment. Insurance underwriters and OSHA enforcement use DART alongside TRIR to assess injury severity profile.

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LTIR / DART (Days Away Only)

Lost Time Incident Rate. Counts only cases resulting in days away from work — the most severe injuries. Some organizations track LTIR separately from the broader DART rate to distinguish cases requiring lost time (more severe) from cases requiring only job transfer or restricted duty (less severe). Workers’ comp indemnity costs are most directly driven by the LTIR cases.

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Severity Rate

Days Away from Work Rate. Total days away from work per 100 full-time employees — calculated as (Total days away × 200,000) ÷ Total hours worked. Measures the average severity of the injuries that are occurring, not just their frequency. An organization with few but very serious injuries has a low TRIR but a high severity rate.

How IncidentVault Tracks TRIR Automatically

IncidentVault calculates TRIR from two data inputs: the OSHA-recordable incident count from incident records, and the total hours worked figure that can be entered manually per period or integrated from payroll data. The AI Insights Chatbot answers TRIR queries instantly: “What is our TRIR for the past 12 months?” “What is our TRIR by establishment?” “How does our current TRIR compare to the same period last year?” — without a manual calculation every time the metric is needed.

TRIR calculated automatically. Trends tracked. Benchmarks visible. No spreadsheets required.

IncidentVault tracks your TRIR, DART rate, and severity metrics automatically from incident records — giving safety managers current performance data without a manual calculation project every reporting period.

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Frequently Asked Questions

A ‘good’ TRIR is one below your specific industry’s average, as published annually by the Bureau of Labor Statistics in the Survey of Occupational Injuries and Illnesses. The BLS publishes TRIR data by detailed NAICS industry code — comparing your rate to the most specific NAICS code that matches your operations gives the most meaningful benchmark. As general context: a TRIR below 1.0 is considered excellent in most industries; 1.0–2.0 is good; 2.0–4.0 is average depending on industry; above 4.0 is above average in most industries though some high-hazard sectors have higher averages. The most actionable benchmark is your own trend over time — a TRIR declining from 4.5 to 3.2 to 2.1 over three years demonstrates a safety program that is working, regardless of where each year’s figure falls relative to industry peers.
OSHA’s recordkeeping standard requires employers to record work-related injuries and illnesses to their own employees — employees on the employer’s payroll. Contractors who are injured on your premises are generally recorded by the contractor (their employer), not by the site host. However, OSHA’s multi-employer worksite policy holds host employers responsible for OSHA recordkeeping for workers they control — if a host employer controls the work of a contractor to the degree that the contractor is effectively working as the employer’s employee, the host may have recordkeeping obligations for that contractor’s injuries. For most traditional contractor relationships where the contractor provides its own supervision and controls its own work methods, contractor injuries are recorded by the contractor and do not appear in the host employer’s TRIR. The OSHA multi-employer worksite rules are complex — always verify your specific recordkeeping obligations for contractor workers with your EHS counsel.
TRIR should be calculated and reviewed at whatever frequency produces actionable information for the organization — for most operations, this means monthly tracking with quarterly trend review. Monthly calculation allows safety managers to see the current-year rate trend as it develops, identify months with elevated incident rates, and correlate TRIR movements with operational changes or seasonal factors. Annual TRIR is the primary metric for regulatory purposes (OSHA 300A posting) and insurance submissions, but organizations that only calculate annually cannot identify negative trends in time to intervene before the annual metric is fixed. IncidentVault calculates TRIR on any time period through the AI Insights Chatbot — allowing safety managers to check the current rolling 12-month rate, the current calendar year rate, or any other period comparison at any time without a manual calculation.
Yes — and this is one of the most valuable applications of TRIR for multi-location organizations. By calculating TRIR separately for each establishment (which OSHA defines as a physical location), organizations can identify which locations have above-average injury rates relative to each other and relative to industry benchmarks. This location-level comparison identifies the highest-risk sites for targeted safety investment, allows peer comparison between locations performing the same work (so differences in TRIR reflect genuine safety management differences rather than differences in work type), and tracks the impact of specific safety interventions at individual locations. IncidentVault’s analytics calculate TRIR by location, allowing portfolio managers to rank locations by safety performance and direct prevention resources to the highest-TRIR sites.
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Legal & Regulatory Disclaimer The information on this page is provided for general informational purposes only and does not constitute legal, insurance, compliance, or risk management advice. Incident management, claims, and legal requirements vary by jurisdiction, industry, and organization type. Always consult qualified legal counsel, your insurance carrier, and applicable regulatory authorities before making decisions about incident reporting procedures, claims management, or compliance programs. IncidentVault is a software platform — not a law firm or insurance company. All figures and estimates referenced are illustrative only.