DART Rate Calculator
Calculate total DART cases and the DART rate based on days-away cases, restricted-work cases, job-transfer cases, and total hours worked. DART Rate Calculator helps safety professionals, employers, and analysts measure workplace injury incidence for OSHA reporting and benchmarking.
Highlights
- Calculates total DART cases from days-away, restricted-work, and job-transfer incidents.
- Computes the OSHA-standard DART rate per 200,000 hours worked.
- Supports workplace safety reporting, benchmarking, and performance analysis.
- Uses total hours worked to normalize injury incidence accurately.
- Provides quick, clear results for safety professionals and employers.
Table of Contents
How DART Rate Calculator Works?
The DART Rate Calculator combines three OSHA-relevant categories of recordable cases: days-away-from-work cases, restricted-work cases, and job-transfer cases. The calculator first adds these inputs to determine the total DART cases.
It then normalizes the total using the total hours worked and the OSHA standard base of 200,000 hours. This produces the number of DART cases per 200,000 hours worked.
For example, with 2 days-away cases, 1 restricted-work case, 1 job-transfer case, and 200,000 total hours worked, the total is 4 DART cases and the DART rate is 4 cases per 200,000 hours.
| Calculation item | Value in example |
|---|---|
| Days Away Cases | 2 |
| Restricted Work Cases | 1 |
| Job Transfer Cases | 1 |
| Total DART Cases | 4 |
| Total Hours Worked | 200,000 |
| DART Rate | 4 cases per 200,000 hours |
Practical Use Cases
Safety professionals can use the calculator to combine days-away, restricted-work, and job-transfer records into a DART rate for periodic OSHA safety reviews and internal incident tracking.
Employers can calculate a consistent workplace injury indicator by entering the total hours worked for a facility, business unit, or reporting period and comparing results across periods.
Safety analysts can use the total DART cases and normalized DART rate to identify changes in incident performance, support trend analysis, and prepare data for benchmarking.
Operations and risk managers can estimate how changes in recordable case counts affect the reported DART rate when evaluating corrective actions and workplace safety programs.
Accuracy and Limitations
The calculator performs the stated arithmetic accurately using integer case counts and total hours worked, with the DART rate calculated as total DART cases multiplied by 200,000 and divided by total hours worked. It accepts 0 to 1,000,000 for each case category and 1 to 1,000,000,000 total hours worked, so zero hours cannot be used as the denominator. Accuracy depends on correctly classifying cases under applicable OSHA recordkeeping rules and entering the complete reporting-period hours; the calculator does not verify records, determine whether an injury is recordable, or account for reporting requirements outside the supplied inputs.
Quick Examples
Example #1: Small Office Safety Report
Calculates the DART rate for a small workplace with a few recordable injury cases during the reporting period.
Example #2: Manufacturing Plant Benchmark
Measures workplace DART performance for a manufacturing facility with several days-away, restricted-work, and job-transfer cases.
Example #3: Large Workforce Safety Review
Evaluates the OSHA DART rate for a large employer with a high number of hours worked and multiple recordable cases.
