# DART rate

> The DART rate counts OSHA cases with days away, restricted work or job transfer per 100 full-time workers. The formula is cases × 200,000 ÷ hours worked.

Source: https://incidentkit.ai/glossary/dart-rate · Updated Oct 5, 2026

Also known as: days away, restricted or transferred rate, DART incident rate

## The formula

OSHA's formula for an incidence rate is (number of injuries and illnesses × 200,000) ÷ employee hours worked. For DART, use the cases in the days-away and job-transfer-or-restriction columns of the Form 300 or 300A. The total case rate adds the other-recordable column.

BLS explains the 200,000: 40 hours a week for 50 weeks, the hours 100 full-time employees commonly work in a year.

Example: 4 DART cases and 500,000 hours worked. 4 × 200,000 = 800,000. Divide by 500,000 to get 1.6 cases per 100 full-time workers.

## How to read it

DART counts cases, not days. It leaves out cases that were recordable only for medical treatment beyond first aid. So DART is never higher than the [total recordable rate](https://incidentkit.ai/glossary/trir). Compare with the BLS rate for your industry, not one national number.

Mix-up: restricted work is not [lost time](https://incidentkit.ai/glossary/lost-time-injury). DART counts restricted and transferred cases. A lost-time rate usually counts only cases with days away. Count days under 29 CFR 1904.7(b)(3), starting the day after the injury.

Use the [TRIR and DART calculator](https://incidentkit.ai/tools/trir-dart-calculator) to run your own numbers.

## Frequently asked questions

### What does DART stand for?

Days Away, Restricted or Transferred. It covers recordable cases with missed work, restricted duty or a job move. OSHA computes it from two columns of the Form 300 or 300A.

### Why is 200,000 hours used?

It equals 40 hours a week for 50 weeks, the hours 100 full-time employees work in a year. It gives cases per 100 workers at any company size.

### What is the difference between DART and TRIR?

TRIR counts every recordable case. DART counts only cases with days away, restriction or transfer. Both use the same 200,000-hour formula.

## Sources

- [OSHA: Establishment-specific injury and illness data (rate definitions)](https://www.osha.gov/Establishment-Specific-Injury-and-Illness-Data)
- [BLS Handbook of Methods: Survey of Occupational Injuries and Illnesses, calculation](https://www.bls.gov/opub/hom/soii/calculation.htm)
- [OSHA 29 CFR 1904.7: General recording criteria](https://www.osha.gov/laws-regs/regulations/standardnumber/1904/1904.7)

## Related terms

- [TRIR (total recordable incident rate)](https://incidentkit.ai/glossary/trir)
- [LTIR (lost-time injury rate)](https://incidentkit.ai/glossary/ltir)
- [Lost-time injury](https://incidentkit.ai/glossary/lost-time-injury)
- [OSHA recordable injury](https://incidentkit.ai/glossary/osha-recordable)
- [First aid (OSHA recordkeeping)](https://incidentkit.ai/glossary/first-aid)

## Related

- [TRIR and DART rates: formula, example and BLS 2024 rates](https://incidentkit.ai/compliance/osha/trir-and-dart-rates)
- [TRIR and DART rate calculator (OSHA formula)](https://incidentkit.ai/tools/trir-dart-calculator)
- [OSHA 300A summary: who signs, when to post, how long](https://incidentkit.ai/compliance/osha/osha-300a-summary)
- [OSHA electronic submission: 29 CFR 1904.41 and the ITA](https://incidentkit.ai/compliance/osha/electronic-submission)
- [OSHA recordkeeping guide: Part 1904 for employers](https://incidentkit.ai/guides/osha-recordkeeping-guide)