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TRIR & DART Rate Calculator
Calculate your OSHA total recordable incident rate and DART rate using the case classifications from your OSHA 300/300A and total employee hours worked.
Your calculated rates
Incident-rate results
Results use the OSHA 200,000-hour incidence-rate base.
Columns G + H + I + J
Columns H + I
Use rates as a comparison tool, not a stand-alone safety score.
A single case can move the rate sharply at a small establishment. OSHA notes that incidence rates are more meaningful when compared with similar operations and workforce sizes.
How the TRIR and DART formulas work
OSHA incidence rates normalize injury and illness experience to a common 200,000-hour base so employers can compare periods or similar operations of different sizes.
TRIR / total case incidence rate
TRIR is commonly used to mean the total recordable incident rate. OSHA materials also use terms such as total case rate (TCR) or total case incidence rate (TCIR). For this calculator, the numerator is the total number of OSHA-recordable cases in the period.
TRIR[(G + H + I + J) × 200,000] ÷ Hours Worked
On the OSHA 300/300A, each recordable case is classified by its most serious outcome: death (G), days away (H), job transfer/restriction (I), or other recordable case (J).
DART rate
DART means Days Away, Restricted, or Transferred. The DART numerator uses cases classified in columns H and I—not the number of days away or restricted.
DART[(H + I) × 200,000] ÷ Hours Worked
Example
Suppose an establishment records 400,000 employee hours, with 0 fatalities, 2 cases with days away, 1 job-transfer/restriction case, and 3 other recordable cases.
TRIR
(6 × 200,000) ÷ 400,000 = 3.00
DART
(3 × 200,000) ÷ 400,000 = 1.50
Common calculation mistakes
- Entering days away from work instead of the number of cases.
- Entering restricted-duty days instead of the number of cases classified in column I.
- Using employee headcount instead of total hours worked.
- Comparing a small establishment directly with a much larger operation without considering the volatility of small-number rates.
- Treating a calculated rate as proof that a case is or is not OSHA-recordable. Recordability must be determined first.
Primary sources
Important boundary
This calculator performs arithmetic only. It does not determine OSHA recordability, whether an establishment is required to keep OSHA injury and illness records, or which BLS benchmark is appropriate. Verify the underlying case classifications and hours before relying on the result.
FAQ
TRIR and DART questions
Is TRIR the same as TCIR?
In common safety usage, TRIR and TCIR are often used for the same basic total-recordable incidence-rate calculation. OSHA publications may use TCR or TCIR terminology.
Does DART use days or cases?
Cases. DART uses the number of cases involving days away from work or job transfer/restriction. Do not add the day totals from Form 300 columns K and L.
Can I compare my rate with an industry average?
Yes, but use the correct industry and establishment context. BLS publishes occupational injury and illness incidence rates by industry and other classifications. Smaller establishments can have highly volatile rates because one case has a larger mathematical effect.
Can I use the calculator for a three-year rate?
Yes, if the numerator contains the cases for the same three-year period and the denominator contains the total employee hours worked over those same three years. OSHA programs such as VPP use the same 200,000-hour base for multi-year rate calculations.
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