Incident Rate Calculator: TRIR, DART, and SIF Rate
By Sean Amalla, SMP, CHST · Published November 12, 2026
The short answer
TRIR (total recordable incident rate), DART (days away, restricted, or transferred rate), and a SIF rate (serious injuries and fatalities) all use the same formula: cases multiplied by 200,000, then divided by total hours worked. The 200,000 is the hours worked by 100 full-time workers in a year, so each result reads as cases per 100 full-time workers. Enter your numbers below.
Calculate your rates
The formulas
The U.S. Bureau of Labor Statistics gives the incidence rate formula as the number of injuries and illnesses multiplied by 200,000, divided by the hours employees worked. Applied to the three rates owners and general contractors ask for most:
- TRIR = (total recordable cases × 200,000) ÷ total hours worked
- DART rate = (DART cases × 200,000) ÷ total hours worked
- SIF rate = (SIF cases × 200,000) ÷ total hours worked
The 200,000 figure is the equivalent of 100 employees working 40 hours a week for 50 weeks. It is what lets you compare a 20-person firm with a 2,000-person project on the same scale. The calculator’s one-month option uses 16,667 hours, which is 200,000 divided by 12.
Source: U.S. Bureau of Labor Statistics, how to compute your firm’s incidence rate
Where the numbers come from
Recordable cases come from your OSHA Form 300 log. DART cases are the recordable cases that involved days away from work, job restriction, or job transfer, which are the days away and job transfer or restriction columns of the log. Every DART case is also a recordable case, so your DART count can never be higher than your recordable count.
SIF cases are not a column on the OSHA 300 log. You classify them yourself, using the definition your company or client uses.
Hours worked come from payroll or other time records and should count the hours employees actually worked, across all employees for the period you are measuring.
TRIR, TCIR, and DART
TRIR is also called the total case incident rate (TCIR), the OSHA incident rate, or the total recordable case rate. They describe the same measure. DART is a subset of it that looks only at the more serious cases.
SIF rate: serious injuries and fatalities
OSHA does not define a SIF rate, and companies and industry groups define SIF a little differently. A common approach counts work-related fatalities plus life-threatening and life-altering injuries and illnesses. The Edison Electric Institute, for example, describes a life-altering injury as one that results in permanent loss of use of an internal organ, body function, or body part.
Once you have your SIF cases, the rate uses the same formula and the same hours as TRIR. Tracking it next to TRIR matters because a low recordable rate does not by itself show that the most serious hazards are under control, which is why many owners and contractors now ask for serious injuries and fatalities separately.
Source: Edison Electric Institute, Serious Injury and Fatality (SIF) criteria
Check how your owner or general contractor defines a SIF before you report one. Counting cases under a different definition makes your rate hard to compare.
Reading your result
A rate means more with context. Compare it with the industry rates the Bureau of Labor Statistics publishes, and with what your owner or general contractor asks for during prequalification. When total hours are low, one case moves the rate a great deal, so look at the trend and the underlying cases as well as the number.
This calculator is an educational aid. It does not decide what is recordable under 29 CFR 1904, and it does not replace your OSHA 300 log or your safety professional.
When the rate points to a coverage gap
If incident follow-up is slipping or the rate is trending the wrong way, a dedicated safety professional on the project can help. CSP places credentialed safety managers and safety coordinators, and can run site compliance audits.
Request a Safety Professional to discuss coverage for your project. CSP provides embedded safety leadership for construction and industrial projects.
Frequently asked questions
What is TRIR?
TRIR is the total recordable incident rate. It is the number of OSHA recordable cases multiplied by 200,000 and divided by total hours worked, which expresses cases per 100 full-time workers.
What is the difference between TRIR and DART?
TRIR counts all recordable cases. DART counts only the recordable cases that involved days away from work, job restriction, or job transfer, so it is always equal to or lower than TRIR.
What is a SIF rate?
A SIF rate is the number of serious injury and fatality cases multiplied by 200,000 and divided by total hours worked. It uses the same formula and hours as TRIR but counts only fatalities and life-threatening or life-altering injuries.
Does OSHA define SIF?
No. OSHA does not define a SIF rate. Industry groups and companies use their own criteria, usually built around fatal, life-threatening, and life-altering outcomes, so confirm the definition your client uses.
Why is the formula multiplied by 200,000?
200,000 is the hours worked by 100 full-time employees in a year, at 40 hours a week for 50 weeks. It puts every employer on the same per-100-worker scale.
What is a good TRIR?
It depends on your industry and on what your owner or general contractor requires. Compare your rate with the Bureau of Labor Statistics rate for your industry and with the project requirements, and watch the trend over time.
What if I do not know total hours worked?
Use payroll or time records. If you only have headcount, the estimate tool in the calculator multiplies employees by hours per week and weeks worked, but actual hours from your records are better.
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