DART Rate Calculator: Days Away, Restricted or Transferred

A DART rate narrows the count. It takes only the cases serious enough to cost someone days at home or to change the job they could do: the column H cases plus the column I cases on your Form 300A. Scaled to 200,000 hours, that count tells you how often an injury or illness took people off their normal work.

Type in four numbers from the 300A. The first box is every recordable case, columns G through J added up. The second and third are the column H and column I counts, and the last is the hours your whole workforce put in over the year. The DART rate comes first in the result, followed by the TRIR, the days-away case rate and a full-time-equivalent count. Each change you make is saved to the address bar, so sharing the link shares your inputs.

Worked example: 5 cases in 210,000 hours

The calculator loads with these made-up totals, which don't belong to any real employer. Picture a plant whose log for the year holds 5 recordable cases. Two of them sent the injured person home for at least a day (column H), two more put someone on light duty or moved them to another job (column I), and the fifth was entered in column J. Across the year its staff logged 210,000 hours.

• DART rate: add the two columns first, 2 + 2 = 4. Then 4 × 200,000 = 800,000, and 800,000 ÷ 210,000 = 3.8095…, which the calculator rounds to 3.81.
• TRIR: all 5 cases go on top, and the result is 4.76.
• Days-away case rate: the 2 column H cases on their own give 1.90.
• Full-time equivalents: 210,000 hours ÷ 2,000 comes to 105.0.

The gap between 4.76 and 3.81 is the one column J case. It's recordable, so the TRIR includes it, but nobody lost time or had their duties changed, so the DART rate leaves it out.

Worked example: one light-duty case in a 10-person shop

Here's a second invented case. A small shop keeps its log and has one recordable injury all year. After the day of the injury, a worker is kept off ladders for a few days, and climbing them is part of the job every week. That case goes in column I. The shop's hours come to 20,000.

Set column I to 1, leave columns G, H and J at 0, and enter 20,000 hours. The DART rate is 10.00, and so is the TRIR, since the only case on the log is a column I case. The days-away case rate is 0.00, and the hours make 10.0 full-time equivalents.

That's what a single entry does to a small employer. Spread the same one case over 200,000 hours, a workforce of about 100, and the DART rate would be 1.00. For how a case or three plays out across several workforce sizes, look at the table on the TRIR calculator.

Which cases DART counts

OSHA's recordkeeping forms package spells out the calculation in one line: "(Number of entries in column H + Number of entries in column I) X 200,000 ÷ Number of hours worked by all employees = DART incidence rate".

The name comes from the lead-in to that line, where the forms package introduces it as the rate for recordable cases involving days away from work, days of restricted work activity or job transfer. The Bureau of Labor Statistics, in release USDL-26-0101, describes days-away cases as part of the "total cases involving days away from work, job restriction, or transfer (DART)" in private industry.

Two columns of the log stay out of the count. Column G holds deaths and column J holds the other recordable cases, and neither appears in the DART formula. Getting a case into the right column is therefore what decides whether it moves your DART rate. If you're unsure where one belongs, or whether it belongs on the log at all, work it through the recordability checker first.

What counts as restricted work

Paragraph (b)(4)(i) of 29 CFR 1904.7 treats work as restricted when, because of the injury or illness, you keep the employee from one or more routine functions of the job or from a full scheduled workday. The same applies when a physician or another licensed health care professional recommends either limit.

Routine has a narrow meaning here. Paragraph (b)(4)(ii) says "an employee's routine functions are those work activities the employee regularly performs at least once per week". A task someone does once a quarter isn't one of them. Paragraph (b)(4)(iv) records a restriction only when it keeps the worker from a routine function or from the full workday they'd otherwise have worked, so keeping someone from that quarterly task alone doesn't make it restricted work.

Slower output isn't a restriction either. Under paragraph (b)(4)(vi), a worker who turns out less than before the injury, while still carrying out every routine function and working the full shift, isn't on restricted work.

How that restriction's day count works — when it starts, which days off still count, and where the 180-day cap lands — is covered in counting days away and restricted work.

DART, TRIR and the days-away rate side by side

All three rates share one formula and differ only in which cases go on top of it. The table near the end of this page sets out each rate, the columns it counts and its formula. The TRIR takes every recordable case, DART takes columns H and I, and the days-away case rate takes column H alone.

The forms package allows for that last kind of variation. After giving the DART line, it says the same formula works for other counts too, naming column I by itself and the skin disorder cases in column M-2 as examples: you put that column's 300A total in place of the case count. The days-away case rate is column H used the same way.

Rounding and published figures

The calculator carries each rate at full precision and rounds it only at the end, half up, to two decimal places. That's a choice made for this site, so that a small change to your hours or cases still shows in the result.

BLS prints its rates with one decimal place, and not always on the same base. The release this page cites gives its two-year case rates, for days away from work (DAFW), for job transfer or restriction only (DJTR) and for the two combined (DART), per 10,000 full-time equivalent workers, while this calculator, like OSHA's formula, works per 100. The release explains how to get from one to the other: a rate per 10,000 converts to a rate per 100 "by moving the decimal point left, two places, and rounding to the nearest tenth". Skip that step and the comparison is off by a factor of 100.

Once both figures are per 100, round this calculator's result to a single decimal before you set it beside BLS's: the 3.81 in the first example becomes 3.8.

Sources (3)

1. OSHA, Forms for Recording Work-Related Injuries and Illnesses (incidence rate instructions) osha.gov
2. 29 CFR 1904.7, General recording criteria (eCFR) ecfr.gov
3. BLS, Employer-Reported Workplace Injuries and Illnesses, 2023-2024 (USDL-26-0101, January 22, 2026) bls.gov

Updated September 19, 2026