Free TRIR Calculator (with DART) — OSHA Incident Rate Formula Explained

The formula and what 200,000 means

The constant 200,000 represents 100 full-time employees each working 40 hours per week for 50 weeks: 100 × 40 × 50 = 200,000. It normalizes your incident count to a common denominator so companies of different sizes can be compared. The result is expressed per 100 full-time equivalents (FTEs).

DART uses the same base: (DART cases × 200,000) ÷ total hours worked. The only difference is what you count in the numerator.

Hours worked = actual hours worked by all employees — from payroll or timesheets. This excludes vacation, sick leave, and holidays, even if paid. Estimation is allowed if actuals are unavailable (scheduled hours or 8 hrs/workday). Include part-time, temporary, and seasonal workers; do not include independent contractors you do not supervise.

Display to one decimal place — this is the BLS convention used in its own published worked examples and benchmarks.

What counts as a recordable case?

Under 29 CFR 1904.7(b)(1)(i)–(vi), a work-related injury or illness is recordable if it results in any of the following:

1. (i) Death
2. (ii) Days away from work
3. (iii) Restricted work or transfer to another job
4. (iv) Medical treatment beyond first aid
5. (v) Loss of consciousness
6. (vi) Diagnosis of a significant injury or illness by a physician or other licensed health care professional

First aid only — including over-the-counter medication at nonprescription strength, simple bandaging, or a single follow-up visit for observation — is not recordable.

Note: fatalities are also reportable to OSHA within 8 hours of learning of the death under 29 CFR 1904.39. This is separate from OSHA 300 recordkeeping — the 8-hour reporting requirement exists regardless of whether your company is otherwise exempt from recordkeeping.

TRIR vs. DART — Form 300 column mapping

The most common confusion in TRIR and DART calculation is which Form 300 columns feed each rate. Use this mapping:

DART ≤ TRIR by definition — DART cases are a subset of recordable cases. If your DART exceeds your TRIR, you have a data-entry error on Form 300.

How prequalification platforms use your TRIR

When you fill out an ISNetworld, Avetta, or Veriforce questionnaire, your TRIR is one of the first numbers requested. Hiring clients set their own thresholds — a GC in heavy construction may accept a higher rate than one doing government work or working for a utility with a strict contractor safety program.

Most platforms request a 3-year TRIR in addition to the current-year figure. A single-year rate can swing significantly for small crews; the 3-year average smooths that volatility and gives reviewers a clearer picture of your safety trend.

TRIR appears alongside EMR and your written safety programs as the three primary safety metrics reviewers evaluate. A strong TRIR with incomplete programs can still trigger a review request — the programs are what document how you achieved the number.

2024 BLS industry benchmarks

The Bureau of Labor Statistics releases its Survey of Occupational Injuries and Illnesses (SOII) annually. The 2024 data, released in January 2026, shows the following sector-level TRIR benchmarks. The release was delayed approximately two months due to the October 1 – November 12, 2025 federal shutdown.

Source: BLS SOII 2024 (released January 2026) [S5, S7]. Sector-level figures only — trade-level sub-NAICS rates are not shown here. Private industry overall 2.3 is the lowest in the BLS series back to 2003, down from 2.4 in 2023 [S5].

There is no universal "good TRIR." Each hiring client sets its own threshold. These sector averages are a reference point — a rate below your sector average is competitive; a rate significantly above it will draw scrutiny from most platforms. Ask your GC or platform contact for their specific cutoff.

What about EMR?

The Experience Modification Rate (EMR, or "mod") is a workers compensation premium multiplier calculated by your state's rating bureau or the NCCI using three years of your claims history. Unlike TRIR — which you compute from your own Form 300 data — EMR is computed by your insurer or rating bureau, and no public formula gives you your exact number in advance. A good EMR to understand or improve is best discussed with your workers comp carrier.

For a full explanation of how EMR is calculated, what affects it, and how it connects to OSHA recordkeeping, see our guide: Workers' Compensation and OSHA Compliance for Contractors.