The DART Rate (Days Away, Restricted, or Transferred Rate) is an OSHA-standardised metric that measures the frequency of occupational incidents resulting in days away from work, restricted work activity, or job transfer, expressed per 100 full-time equivalent workers. The calculation is normalised by a constant of 200,000 hours — equivalent to the annual working hours of 100 full-time employees — which enables meaningful comparisons between organisations of different sizes.
The metric originates from OSHA 29 CFR 1904, which establishes the recordkeeping and reporting obligations for occupational injuries and illnesses for most US employers with 11 or more employees. The DART Rate is derived from data recorded on OSHA 300 (Log of Work-Related Injuries and Illnesses) and OSHA 300A (Summary) forms, with electronic submission required via the Injury Tracking Application (ITA) for establishments in high-hazard industries with 100 or more employees.
Adoption of the DART Rate extends well beyond the United States: organisations worldwide use the OSHA methodology as a reference for international benchmarking, adapting the criteria to applicable national standards. In the UK, RIDDOR 2013 and HSE guidance complement the OSHA framework. In the European Union, EU-OSHA and the Framework Directive 89/391/EEC provide the broader regulatory context. ISO 45001:2018 provides a globally recognised occupational health and safety management framework that aligns with DART Rate reporting.
For the EHS professional, the DART Rate is one of the most important reactive indicators for evaluating safety programme effectiveness. Unlike TRIR, which counts all recordable incidents, the DART Rate filters for those that caused actual disruption to a worker's productive capacity. Systematic analysis by operational area, shift, risk category, and injury type enables identification of patterns before they recur and more precise targeting of preventive resources.
For executive leadership, the DART Rate has direct cost and reputational implications. Each DART case generates direct costs (medical treatment, temporary replacement, overtime) and indirect costs that are difficult to quantify (productivity loss, team morale impact, rework). A high rate can increase insurance premiums, compromise qualification in tender processes, and attract OSHA scrutiny via its Site-Specific Targeting (SST) programme.
For human resources and operations teams, the DART Rate directly reflects workforce availability. A rising DART Rate signals pressure on capacity planning: more absences, work restrictions, and temporary reassignments create disruptions in operational flow, require retraining, and place greater burdens on healthy workers. Tracking by department and role facilitates contingency planning and prioritisation of ergonomic and preventive investments.
DART Rate = (Number of DART cases x 200,000) / Total hours worked
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The value 200,000 is OSHA's standard normalisation constant, calculated as: 100 full-time employees x 40 hours per week x 50 weeks per year = 200,000 hours. It allows organisations of different sizes to be compared on a basis equivalent to per 100 full-time workers per year.
A manufacturing company with 450 employees recorded 6 DART cases in 2024. Total hours worked during the period were 900,000.
DART Rate = (6 x 200,000) / 900,000 = 1,200,000 / 900,000 = 1.33
The company's DART Rate is 1.33 -- below the manufacturing sector average (approx. 1.3, BLS 2023).
A good DART Rate is one that is consistently below the sector average and on a downward trajectory over time. The most widely used global reference is data from the US Bureau of Labor Statistics (BLS), published annually in the Survey of Occupational Injuries and Illnesses (SOII).
Note on methodology: BLS and HSE data are not directly comparable. BLS DART rates use 200,000 hours as the normalisation constant (equivalent to 100 FTE). The UK's Health and Safety Executive (HSE) publishes injury rates under RIDDOR 2013, which uses different thresholds (injuries resulting in 7 or more consecutive days off work, compared to OSHA's 1 day minimum for DART) and different denominators (per 100,000 workers). Use BLS data as the primary benchmark for DART Rate comparisons.
OSHA distinguishes between first aid (not recordable) and medical treatment beyond first aid (recordable, but not necessarily DART). A case only enters the DART count if there is also days away, restriction, or transfer. This distinction is frequently misapplied, leading to systematic under-recording.
Under RIDDOR 2013, employers must report injuries resulting in 7 or more consecutive days away from work (compared to OSHA's threshold of 1 day). This means RIDDOR-reportable injuries are a narrower subset than OSHA DART cases. For international benchmarking purposes, UK organisations should calculate their DART Rate using OSHA criteria, even if RIDDOR reporting uses different thresholds. The two reporting obligations are separate and are not mutually exclusive.
The DART Rate is one of several performance indicators coexisting in the EHS ecosystem. Understanding the differences between them prevents misinterpretation and enables the construction of a complementary metrics dashboard.
The relationship between TRIR and DART is particularly revealing: if both values are similar, most recordable incidents are resulting in days away or restriction -- a sign of high average severity. If DART is much lower than TRIR, many minor incidents are being recorded, which may reflect a healthy reporting culture.
The AFR (Accident Frequency Rate), widely used in the UK and continental Europe, expresses the number of accidents per 1,000,000 hours worked -- a different denominator from DART Rate's 200,000 hours. Direct comparison requires conversion: AFR / 5 = approximate DART Rate equivalent. However, definitional differences in what constitutes a recordable accident mean this conversion should be used for orientation only.
The DART Rate measures what has already happened -- established injuries with operational impact. It does not reveal unrealised risks, the quality of preventive programmes in operation, or the maturity of an organisation's safety culture. A low DART Rate can coexist with systematic under-reporting, serious latent failures, or an environment where risks have simply not yet materialised.
Organisations that improve their reporting culture -- encouraging workers to record all incidents, including minor ones -- may see their DART Rate temporarily increase, even without any deterioration in actual safety. Conversely, pressure not to record incidents or inappropriate classification of cases as first aid produces an artificially low DART Rate that masks real risk.
For robust EHS management, the DART Rate should be accompanied by proactive indicators:
Heinrich's triangle model suggests that for every serious accident there are dozens of minor incidents and hundreds of unsafe acts. Whilst useful as a pedagogical model, more recent research indicates that the causes of serious incidents are not necessarily the same as those of minor accidents. This limits the predictive validity of the DART Rate as a proxy for catastrophic event risk, reinforcing the need for complementary risk analysis approaches.
Historically, DART Rate calculation was performed manually from spreadsheets and paper records — a process prone to classification errors, input inconsistencies, and significant delays in data availability. Monitoring was retrospective and episodic, typically consolidated only at the end of the quarter or financial year.
The digitalisation of EHS processes has transformed the speed and quality of DART Rate management. Modern EHS management platforms enable real-time incident recording directly from the field, with automated workflows for notification, investigation, and corrective action. DART Rate calculation becomes continuous — updated with each new record — eliminating dependency on manual consolidations and reducing the risk of classification errors.
Integration between DART Rate data and leading indicators — inspection records, near misses, behavioral audits — enables identification of predictive correlations before a new DART case occurs. Organisations adopting EHS platforms with advanced analytics can reduce their DART Rate systemically rather than reactively, converting historical data into concrete preventive actions.
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DART stands for Days Away, Restricted, or Transferred. It describes the three types of consequence that make an occupational incident classifiable as a DART case: the worker takes days away from work, performs duties with medically-directed restrictions, or is temporarily transferred to a different role — all on medical advice due to a work-related injury or illness.
The DART Rate is calculated using the formula: (Number of DART cases x 200,000) / Total hours worked in the period. The result represents the number of DART cases per 100 full-time equivalent workers per year. Total hours worked should include all directly supervised workers (employees and contractors alike), excluding holiday, leave, and absence hours.
A good DART Rate is one that is consistently below the sector average and on a downward trajectory. According to BLS 2023 data, the average for US private industry is approximately 1.3. Values below 1.0 are considered excellent for most industrial sectors. However, a low value must always be interpreted alongside the robustness of the reporting system — artificially low rates from under-reporting are a risk signal, not a performance indicator.
No. TRIR counts all recordable incidents, including those resulting only in medical treatment beyond first aid. The DART Rate is a subset of TRIR: it counts only the most consequential cases — days away, restriction, or transfer. The DART Rate can never be higher than TRIR; if they are equal, every recordable incident resulted in one of these three consequences — a sign of high average severity.
Under OSHA guidelines, workers supervised directly by the organisation should be included, regardless of formal employment status. If the organisation controls the activities, the worksite, and the equipment used by a contract worker, that worker's incidents should be recorded in the host organisation's OSHA log. For UK organisations, similar principles apply under RIDDOR and the Health and Safety at Work Act 1974.
Liability and workers' compensation insurers use DART Rate history — in combination with TRIR and severity rate — as a factor in premium pricing. Organisations with above-average DART Rates tend to pay higher premiums. The Experience Modification Rate (EMR) used in the US is closely correlated with DART Rate performance over a rolling three-year period.
Yes, it is mathematically possible to record a DART Rate of zero in a specific period — meaning no cases involving days away, restriction, or transfer were recorded. A persistently zero DART Rate in medium to large organisations should be interpreted with caution, as it may indicate under-reporting. Small organisations with low physical risk exposure can genuinely achieve and sustain a DART Rate of zero.
The DAFW Rate (Days Away From Work Rate) is a subset of the DART Rate: it counts only cases in which the worker took one or more days away from work, excluding restricted work and job transfer cases. The difference between the two values indicates the volume of cases managed through modified duty or return-to-work programmes — an effective strategy for reducing absences without eliminating the DART entirely.
In the United States, most employers with 11 or more employees are legally required to maintain OSHA 300 logs and calculate the DART Rate for annual reporting via the 300A Summary. High-hazard establishments with 100 or more employees must submit data electronically via the ITA. In the UK, RIDDOR 2013 mandates reporting of specified injuries and over-seven-day injuries, but does not use the DART Rate format directly. For EU organisations, national transpositions of Framework Directive 89/391/EEC define applicable reporting requirements.
Industrial companies — particularly in oil and gas, mining, heavy construction, and complex manufacturing — frequently require suppliers to demonstrate a DART Rate below a defined threshold as a pre-qualification criterion. A high DART Rate can automatically disqualify an organisation from industrial service contracts, regardless of price or technical capability. DART Rate history is typically requested alongside TRIR and EMR as part of contractor safety pre-qualification questionnaires.
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