DART Rate Calculator: Days Away, Restricted or Transferred
The DART rate counts the recordable cases that involved days away from work, restricted work activity or transfer to another job, per 100 full-time workers. It is a better signal of injury seriousness than TRIR because it ignores cases that needed only medical treatment. Enter your 300 log totals to get the rate, plus a severity rate.
Your numbers
Count from column H of your OSHA 300 log.
Count from column I of your OSHA 300 log. Do not include cases already counted as days away.
Sum of column K, capped at 180 days per case as OSHA allows.
Sum of column L.
All employee hours actually worked in the same period.
Your results
Calculation aid only. Day counts and case classification must follow 29 CFR Part 1904 and your OSHA 300 log.
DART rate by hours worked
Sweeps Total hours worked from 100000 to 1000000, holding your other inputs fixed.
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How to use this calculator
Open your OSHA 300 log for the period and total the cases in the days away column and the job transfer or restriction column. Then total the days in each of the two day columns. Enter those four numbers plus total hours worked. The calculator gives the DART rate, the days away only rate, a severity rate and the average days per case. The chart shows how the same case count translates to different rates as your hours change, which is helpful when comparing a small site with a large one.
Formula and definitions
DART rate equals the sum of days away cases and restricted or transfer cases, multiplied by 200,000 and divided by hours worked. The severity rate multiplies total days lost or restricted by the same 200,000 and divides by hours. Counting of days follows 29 CFR 1904.7 and 1904.151: count calendar days, start the day after the injury, and stop counting once a case reaches 180 days. A case with days away that also had restricted days is counted once in the case total.
- Days away: the employee could not work at all
- Restricted work: the employee could not do one or more routine job functions or the full shift
- Transfer: the employee was moved to a different job
- Do not count the day of injury
Worked example
Two days away cases and three restricted cases on 395,000 hours give 5 times 200,000 divided by 395,000, a DART rate of about 2.5. The days away only rate is about 1.0. With 107 total days, the severity rate is about 54, and the average case lost roughly 21 days. If your DART is low but severity is high, a few serious cases dominate, and that points to a different corrective approach than many minor restrictions.
Common mistakes
Teams often double count a case in both the days away and restricted columns, or keep counting days beyond the 180 day cap. Another trap is treating a doctor-recommended restriction that the employer ignored as not recordable. Also keep your log and your hours aligned to the same establishment. If you track DART by site, avoid averaging site rates; recompute from summed cases and summed hours instead.
Frequently Asked Questions
What does DART stand for?
Days Away, Restricted or Transferred. It covers recordable cases where the worker missed days, could not do full duties, or was moved to a different job. Cases that only needed medical treatment are not included.
Is DART the same as lost time injury rate?
Not exactly. Lost time rate normally counts only days away cases. DART adds restricted and transfer cases, so it is always equal to or higher than the days away rate.
Where do I get the case counts?
From your OSHA Form 300 log, in the columns for days away from work and job transfer or restriction. The 300A annual summary also totals them for you.
Why does OSHA use 200,000 hours?
It equals 100 full-time employees working 40 hours a week for 50 weeks. That standard base lets a small and a large establishment be compared as cases per 100 workers.
Want DART, TRIR and near miss counts to roll up by plant automatically? We can connect your ERP hours and your incident log into one read-only dashboard.
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