DART Rate Calculator

Calculate your company OSHA DART (Days Away, Restricted, or Transferred) incident rate and compare workplace safety metrics.

Industry Preset Scenarios

1-click real-world workplace safety setups

Calculation Parameters

Log detail level

Industry sector benchmark (BLS NAICS)

Total employee hours worked in period

Days away from work cases (Col. H)

Job transfer / restriction cases (Col. I)

Severity & Additional Recordables (OSHA 300 Log)

Other recordable cases (Col. G fatalities + Col. J other)

Total lost calendar days (Col. K)

Total restricted calendar days (Col. L)

OSHA DART Incident Rate

2.00

Total DART Cases (Col H+I)

Severe incident count

Total Recordable Rate (TRIR)

3.20

8 total OSHA cases

Days Away Rate (DAFW)

1.20

3 lost-time cases

Job Transfer / Restrict Rate

0.80

2 light-duty cases

DART Severity Rate

30.0

Days lost / 100 workers

Avg Days Lost per Case

15.0 days

75 total lost days

Industry DART Benchmark

2.20

BLS national average for Manufacturing (NAICS 31-33)

Comparison to Industry Avg

-9.1%

Lower incident rate than industry peer group

At Industry BaselineNear Industry Benchmark Average

Your DART rate of 2.00 is comparable to the typical industry average of 2.20.

Workplace Incident Composition

Total Cases8

Days Away Cases (Col. H)3 incidents37.5%
Job Transfer / Restriction Cases (Col. I)2 incidents25.0%
Other Recordable Cases (Col. G & J)3 incidents37.5%

OSHA Form 300 & 300A Recordkeeping Summary

Direct alignment with official OSHA injury log column classifications.

OSHA Form Column	Incident Classification	Your Count	DART Rate Contribution
Column H	Cases with days away from work	3	1.20
Column I	Cases with job transfer or restriction	2	0.80
Columns G & J	Fatalities (G) & other recordable injuries (J)	3	Included in TRIR only
Columns H + I Total	Total Severe DART Incidents	5	2.00

Step-by-Step DART Rate Formula Breakdown

Complete mathematical progression computing OSHA DART, TRIR, and Severity rates standardized per 100 full-time workers.

Step 1: Determine Total DART Cases
$\text{DART Cases} = \text{Cases with Days Away (H)} + \text{Cases with Restriction/Transfer (I)} = 3 + 2 = 5$
Sum recordable cases involving days away from work (Column H) and cases with job transfer or restriction (Column I):
Step 2: Calculate OSHA DART Rate
$\text{DART Rate} = \frac{\text{DART Cases} \times 200{,}000}{\text{Total Hours Worked}} = \frac{5 \times 200,000}{500,000} = \mathbf{2.00}$
Multiply total DART incidents by OSHA's standard 100-employee base (200,000 hours) and divide by actual employee hours worked:
Step 3: Calculate Total Recordable Incident Rate (TRIR)
$\text{TRIR} = \frac{\text{Total Recordable Cases} \times 200{,}000}{\text{Total Hours Worked}} = \frac{8 \times 200,000}{500,000} = \mathbf{3.20}$
Evaluate the overarching rate of all recordable workplace injuries and illnesses across all OSHA Form 300 categories (Columns G, H, I, J):
Step 4: Calculate DART Severity Rate
$\text{Severity Rate} = \frac{\text{Total Lost + Restricted Days} \times 200{,}000}{\text{Total Hours Worked}} = \frac{(45 + 30) \times 200,000}{500,000} = \mathbf{30.00}\text{ days / 100 FTE}$
Quantify the number of lost and restricted calendar workdays per 100 full-time workers:
Step 5: Average Days Lost or Restricted per DART Case
$\text{Avg Days / DART Case} = \frac{\text{Total Lost + Restricted Days}}{\text{DART Cases}} = \frac{75}{5} = \mathbf{15.0}\text{ calendar days}$
Compute the average length of disruption for each severe safety incident:

Report tool

Understanding the OSHA DART Rate in Workplace Safety

The DART Rate (Days Away, Restricted, or Transferred rate) is one of the most critical safety performance indicators monitored by the Occupational Safety and Health Administration (OSHA) and the U.S. Bureau of Labor Statistics (BLS). While broader safety metrics like the Total Recordable Incident Rate (TRIR) count all work-related injuries and illnesses requiring medical treatment beyond first aid, the DART rate isolates the more severe incidents: those that force an employee to miss full shifts of work, perform restricted duties, or transfer temporarily or permanently to a different job.

Tracking your establishment DART rate enables safety managers, operations directors, and executive leadership to evaluate the actual severity and operational disruption of workplace incidents. A high DART rate signals not only physical hazards on the floor, but also escalating workers compensation expenses, higher Experience Modification Rates (EMR), operational bottlenecks, and increased risk of programmed OSHA inspections. In parallel with monitoring general workforce turnover via the attrition rate calculator and managing overall operational overhead using the cost of doing business calculator, maintaining an accurate DART log is essential for proactive risk governance.

The OSHA DART Rate Formula

OSHA standardizes workplace incident rates per 100 full-time equivalent (FTE) employees over a one-year period. Assuming an average employee works 40 hours per week for 50 weeks per year (2,000 annual hours), a baseline cohort of 100 full-time workers accumulates 200,000 total exposure hours.

The standard mathematical formula defined by OSHA for computing the DART rate is:

\text{DART Rate} = \frac{(\text{Days Away Cases} + \text{Job Transfer/Restriction Cases}) \times 200{,}000}{\text{Total Hours Worked by All Employees}}

The key components of this calculation correspond directly to entries on official OSHA Form 300 logs and annual Form 300A summary reports:

Cases with Days Away from Work (OSHA Form 300, Column H): The number of recordable injury or illness cases that caused the affected worker to miss at least one full calendar workday following the date of the incident.
Cases with Job Transfer or Work Restriction (OSHA Form 300, Column I): The count of recordable incidents where the employee remained at work but was restricted from performing routine job duties or was reassigned to alternative tasks.
200,000 Hours: The OSHA standardization constant representing the annual hours worked by 100 full-time employees (100 workers × 40 hours/week × 50 weeks).
Total Hours Worked: The aggregate actual hours worked by all employees (hourly, salaried, temporary, leased, and seasonal) during the measurement timeframe. This total excludes non-working hours such as paid time off, vacations, holidays, and sick leave.

Worked Calculation Example

Consider a mid-sized precision manufacturing plant with 250 full-time equivalent employees operating across day and night shifts. Over the course of a calendar year, payroll records indicate that all employees combined worked a total of 500,000 hours.

Reviewing the annual OSHA Form 300 log reveals the following recordable incident figures:

Cases involving days away from work (Column H): 3
Cases involving job transfer or light-duty restriction (Column I): 2
Other recordable cases requiring medical treatment with no lost time (Column J): 3
Fatalities (Column G): 0

Step 1: Calculate Total DART Cases

First, sum the severe cases that resulted in lost time or job restriction:

\text{Total DART Cases} = \text{Column H} + \text{Column I} = 3 + 2 = 5\text{ DART Cases}

Step 2: Apply the OSHA DART Rate Formula

Standardize the DART incident count across the 500,000 actual hours worked:

\text{DART Rate} = \frac{5 \times 200{,}000}{500{,}000} = \frac{1{,}000{,}000}{500{,}000} = \mathbf{2.00}

This outcome means that for every 100 full-time equivalent employees, the facility experienced 2.00 severe lost-time or restricted-duty injuries during the year.

Step 3: Compare with Total Recordable Incident Rate (TRIR)

To evaluate what portion of overall recordables resulted in severe disruption, calculate the Total Recordable Incident Rate:

\text{TRIR} = \frac{(3 + 2 + 3 + 0) \times 200{,}000}{500{,}000} = \frac{8 \times 200{,}000}{500{,}000} = \mathbf{3.20}

Out of 8 total recordable incidents, 5 (or 62.5%) were DART cases. By comparing the DART rate of 2.00 against the national manufacturing industry benchmark of 2.20, safety managers can verify that the facility is operating slightly below national incident averages.

DART Rate vs. TRIR vs. Severity Rate

A comprehensive safety dashboard utilizes three complementary OSHA metrics to understand different dimensions of workplace safety:

Safety Metric	What It Measures	OSHA Form 300 Columns	Primary Management Objective
TRIR / TCIR	Total frequency of all recordable injuries and illnesses per 100 workers	Columns G, H, I, J	High-level safety baseline and general regulatory screening
DART Rate	Frequency of severe cases resulting in lost workdays, restrictions, or transfers	Columns H, I	Assessing operational disruption and OSHA audit vulnerability
DART Severity Rate	Total number of lost and restricted calendar workdays per 100 workers	Columns K, L	Measuring direct financial impact, wage replacement, and recovery duration

When an employee misses days of work, tracking total scheduled hours versus actual productive hours with tools like the absence percentage calculator helps human resources evaluate unplanned staffing losses across production shifts.

Industry Benchmarks and OSHA Site-Specific Targeting (SST)

DART rates vary significantly across economic sectors due to the inherent hazards of specific working environments. The U.S. Bureau of Labor Statistics publishes annual tables summarizing private industry incident rates categorized by North American Industry Classification System (NAICS) codes:

Transportation & Warehousing (NAICS 48-49): Benchmark DART rate of ~3.7 incidents per 100 FTEs due to heavy material handling, forklift operations, and repetitive loading.
Healthcare & Social Assistance (NAICS 62): Benchmark DART rate of ~3.3 incidents per 100 FTEs, driven by patient lifting, slips, trips, and biological exposures.
Manufacturing (NAICS 31-33): Benchmark DART rate of ~2.2 incidents per 100 FTEs, reflecting machinery, cutting, and assembly line operations.
Retail Trade (NAICS 44-45): Benchmark DART rate of ~2.0 incidents per 100 FTEs.
Construction (NAICS 23): Benchmark DART rate of ~1.4 incidents per 100 FTEs.
Professional & Business Services (NAICS 54): Benchmark DART rate of ~0.5 incidents per 100 FTEs.

Under OSHA Site-Specific Targeting (SST) inspection plan, the agency reviews establishment data submitted electronically through the Injury Tracking Application (ITA). Facilities reporting DART rates or TRIR numbers significantly above the national averages for their specific NAICS code are prioritized for comprehensive, unannounced on-site OSHA inspections.

Financial and Operational Impacts of Elevated DART Rates

Workplace injuries carry significant hidden and indirect costs that extend well beyond immediate medical treatment. Key commercial repercussions include:

Workers Compensation EMR Surcharges: A history of frequent lost-time claims inflates your Experience Modification Rate (EMR). An EMR above 1.0 acts as a direct multiplier on annual workers compensation insurance premiums, adding tens or hundreds of thousands of dollars to ongoing operational expenses.
Commercial Bidding Disqualifications: In construction, heavy engineering, oil and gas, and enterprise supply chain procurement, request-for-proposal (RFP) guidelines frequently disqualify contractors whose DART rate exceeds 1.0 or exceeds industry averages.
Overtime and Temporary Staffing Costs: When experienced team members are out on days away, businesses must hire temporary replacements or pay overtime wages, which can be tracked alongside regular payroll using the 12 hour shift pay calculator or California overtime calculator.
Loss of Productive Capacity: Injured employees placed on modified or restricted duties operate at reduced throughput, requiring supervision, ergonomic task redesign, and cross-training adjustments.

Best Practices for Reducing Your DART Rate

Proactive organizations implement targeted administrative and engineering controls to prevent severe incidents and safely accelerate return-to-work timelines:

Structured Modified-Duty Return-to-Work Programs: Collaborating with occupational health providers to create transitional light-duty roles allows recovering employees to remain at work safely. While a restricted case still counts toward your DART rate, it prevents consecutive lost calendar days, keeping severity rates lower and minimizing direct wage replacement costs.
Ergonomic Risk Assessments: Over 60% of DART incidents across manufacturing and logistics stem from musculoskeletal disorders caused by repetitive motion, awkward lifting postures, and material handling. Deploying mechanical lift assists and adjustable workstations addresses primary root causes.
Near-Miss and Leading Indicator Tracking: Establish a non-punitive hazard reporting system. Investigating near-misses and addressing floor hazards before they result in physical harm prevents high-severity OSHA recordables.
Regular Job Safety Analysis (JSA): Conduct periodic job hazard analyses on high-risk machinery, maintenance routines, and material transfer stations, updating standard operating procedures (SOPs) and personal protective equipment (PPE) requirements accordingly.

Frequently asked questions

What is the exact difference between DART rate and TRIR?

TRIR (Total Recordable Incident Rate) measures all recordable work-related injuries and illnesses, including cases that only required medical treatment beyond first aid. In contrast, the DART rate only counts the subset of more severe incidents that resulted in days away from work, restricted duty, or job transfer. Your DART rate will always be less than or equal to your TRIR.

Why does the OSHA DART formula use 200,000 hours?

The constant of 200,000 represents the base number of hours worked by 100 full-time equivalent employees in a year (100 workers multiplied by 40 hours per week across 50 work weeks). Using this standard multiplier allows organizations of any size to benchmark their safety records on an apples-to-apples basis.

How do weekend and holiday days count toward days away or restricted days?

Under OSHA recordkeeping standard 29 CFR 1904.7, employers must count calendar days rather than scheduled workdays. If an employee is injured on Friday and the physician restricts them through Monday, Saturday and Sunday count toward total lost or restricted days even if the employee was not scheduled to work on the weekend.

Is there a maximum cap on lost or restricted days recorded on OSHA Form 300?

Yes. OSHA rules specify that employers can stop counting lost or restricted calendar days once the total reaches 180 days for a single injury or illness case (OSHA 1904.7(b)(3)(vii)). This cap prevents a single catastrophic incident from skewing annual severity calculations indefinitely.

Does first aid treatment count toward your DART rate?

No. Incidents requiring only first aid treatment (such as bandaging minor cuts, using non-prescription medications at non-prescription strengths, or eye flushes) are not OSHA recordable cases and are never included in DART or TRIR calculations.

What constitutes a good DART rate for a business?

A good DART rate is one that is significantly below the national average for your specific NAICS industry sector published by the Bureau of Labor Statistics. For example, while professional office settings average ~0.5, manufacturing averages ~2.2 and warehousing averages ~3.7. Achieving a rate in the lowest 25th percentile of your industry represents strong safety performance.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.