Safety performance calculator
Calculate the normalized rate for cases involving days away from work, restricted work activity, or transfer to another job.
Enter both DART case categories and employee hours, then select Calculate DART Rate. The normalized rate and equation will appear here.
Formula
The calculator combines qualifying case counts and applies the standardized incidence-rate formula:
DART rate = ((days-away cases + restricted or transferred cases) × 200,000) ÷ employee hours worked
The 200,000-hour base represents 100 full-time employees working 2,000 hours each during a year.
Case counts
The result expresses the entered DART case experience per 100 full-time-equivalent workers. Interpretation should account for workforce size, reporting period, industry, establishment type, exposure hours, and recordkeeping quality.
Smaller workforces may experience substantial rate changes from a single additional case. Review rates alongside incident details, hazards, controls, workforce changes, and leading safety indicators.
This calculator does not determine whether a case is recordable, classify OSHA 300 Log entries, validate employee-hour totals, choose an industry benchmark, prove that a workplace is safe, or establish compliance.
DART refers to cases involving days away from work, restricted work activity, or transfer to another job.
The calculator adds the entered days-away cases and restricted-work or job-transfer cases, multiplies that combined count by 200,000, and divides the result by employee hours worked during the same reporting period.
Enter case counts. Do not enter the number of days away, restricted days, or transfer days in the case-count fields.
No. DART is a lagging incidence-rate measure. It does not prove overall safety performance, validate recordkeeping, predict individual risk, or establish regulatory compliance.
Primary references
Review these primary OSHA resources alongside current state-plan, local, project, manufacturer, employer, and qualified-professional requirements that apply to the work.
Official OSHA recordkeeping resources, forms, requirements, and reporting guidance for workplace injuries and illnesses.
Official OSHA guidance explaining DART case categories, the incidence-rate calculation, and the standardized 200,000-hour base.
External references are provided for research and verification. Their inclusion does not make a generated document compliant, approved, certified, or complete for a particular workplace.