OSHA Recordable Rate Calculator
Calculate TRIR and DART rates from hours worked and incident counts.
About this calculator
TRIR (Total Recordable Incident Rate) and DART rate (Days Away, Restricted, or Transferred rate) are the two safety metrics OSHA-covered employers use to benchmark their injury and illness experience against industry peers and their own history. Both are calculated the same way: the incident count multiplied by 200,000, divided by total hours worked. The 200,000 figure isn't arbitrary -- it represents 100 full-time employees each working 40 hours a week for 50 weeks a year, so the resulting rate is normalized to "per 100 employees per year" regardless of how many people your actual workforce has or how many hours they logged.
TRIR uses every OSHA-recordable incident from your OSHA 300 log, while DART rate uses only the subset of those incidents serious enough to cause days away from work, work restrictions, or a job transfer -- so DART rate is always the same or lower than TRIR for the same period, since every DART case is also a recordable incident but not every recordable incident rises to DART severity. Because both formulas divide by total hours worked, a company can lower its rate either by genuinely reducing incidents or by growing hours worked (more employees, more overtime) without changing incident count at all -- which is why rates are typically tracked over consistent time periods and compared within the same industry classification, where OSHA and BLS publish average TRIR and DART benchmarks.
Inputs
Results
TRIR
2
DART Rate
1.2
Figures current as of 2026. Source: OSHA, Injury and Illness Recordkeeping Forms 300, 300A, and 301 -- Instructions for Form 300A (Summary of Work-Related Injuries and Illnesses)
How to Use This Calculator
- Enter total OSHA recordable incidents for the period from your OSHA 300 log.
- Enter DART cases — incidents involving days away, restricted duty, or job transfer.
- Enter total employee hours worked for the same period.
- Read TRIR and DART Rate, both scaled per 200,000 hours worked (100 employees over a year).
- Review Incidents per Employee alongside TRIR and DART Rate to gauge overall incident frequency.
How the result changes with Total Recordable Incidents
| Total Recordable Incidents | TRIR | DART Rate |
|---|---|---|
| 2.5 | 1 | 1 |
| 3.75 | 1.5 | 1.2 |
| 7.5 | 3 | 1.2 |
| 13 | 5.2 | 1.2 |
What each input means
- Total Recordable Incidents
- Total OSHA recordable incidents in the period.
- DART Cases
- Days Away, Restricted, or Transferred cases -- a subset of Total Recordable Incidents, so it's capped at that total.
- Total Hours Worked
- Total employee hours worked in the period.
How this is calculated
Worked example, using the default values
- Identify Input ParametersTotal Recordable Incidents = 5, DART Cases = 3, Total Hours Worked = 500000 = 3 input(s) provided
- Calculate TRIRTRIR2 = 2
- Calculate DART RateDART Rate1.2 = 1.2
- Calculate Incidents per EmployeeIncidents per Employee0.02 = 0.02
- Calculate Hours WorkedHours Worked500000 = 500000
Figures and sources
- Total recordable case (TRIR) and DART incidence rate formula: (incidents x 200,000) / hours worked, where 200,000 hours represents 100 employees working 40 hours/week for 50 weeks/year (2026) — OSHA, Injury and Illness Recordkeeping Forms 300, 300A, and 301 -- Instructions for Form 300A (Summary of Work-Related Injuries and Illnesses)
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why is the 200,000 figure used instead of just dividing incidents by hours worked?
200,000 hours represents 100 full-time employees working 40 hours a week for 50 weeks a year -- using it as the multiplier normalizes the rate to "incidents per 100 employees per year" regardless of your actual headcount or hours logged. That makes TRIR and DART rate comparable across companies of very different sizes and comparable to published industry-average benchmarks.
Can DART rate ever be higher than TRIR for the same period?
No -- DART cases are a subset of total recordable incidents, specifically those serious enough to cause days away from work, restricted duty, or a job transfer. Every DART case counts as a recordable incident, but not every recordable incident is severe enough to be a DART case, so DART rate is always the same as or lower than TRIR for the same reporting period. This calculator enforces that relationship directly: if you enter a DART case count higher than your total recordable incidents, it's treated as equal to the total (since DART cases can't logically outnumber the recordable incidents they're drawn from) rather than producing a DART rate above TRIR.
Does adding more employee hours worked always lower TRIR if incidents stay flat?
Yes -- TRIR is incidents multiplied by 200,000 and divided by hours worked, so for a fixed incident count, more total hours worked in the denominator produces a lower rate. This is a real mathematical effect of workforce growth or added overtime, not necessarily a sign that the workplace got safer, which is one reason rates are typically tracked against consistent time periods rather than compared across very different-sized reporting windows.
Do DART cases affect the TRIR figure at all?
No -- TRIR is calculated purely from total recordable incidents and hours worked; the DART case count doesn't enter that formula at all. DART rate is calculated separately, using the DART case count in place of total incidents in the same 200,000-hour normalized formula.
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Noise Exposure Calculator
Calculate TWA noise dose and determine hearing protection requirements per OSHA standards.
OSHA & Workplace SafetyPPE Selection Calculator
Determine required PPE categories and estimated costs from hazard assessment.
Occupational HealthFirst Aid Kit Calculator
Kit contents from employee count and workplace hazards.
Pattern MakingDart Manipulation Calculator
Calculate dart rotation and distribution for pattern adjustments including angle, width, and depth per dart.
OSHA & Workplace SafetyConfined Space Air Monitoring Calculator
Evaluate LEL, O2, H2S, and CO readings against OSHA action levels for permit-required confined spaces.
More in Safety, Compliance & Emergency.