DART Rate Calculator (Days Away, Restricted or Transferred)

What is DART Rate?

DART Rate stands for Days Away, Restricted, or Transferred Rate. It measures how often serious work-related injuries/illnesses occur that result in:

  • Days away from work
  • Restricted work activity
  • Job transfer

DART is a lagging safety KPI that focuses on impact on work capability (not just injury counts). It is widely used for internal benchmarking and management review.

Standards & Legal Reference (Accuracy-First)

OSHA (United States) – 29 CFR Part 1904 (Recordkeeping)

  • DART is a legally defined and commonly reported KPI under OSHA recordkeeping.
  • OSHA uses the 200,000 base to normalize rates for comparison.

Important clarification (global use): Outside the United States, DART is generally not a statutory legal reporting requirement, but is widely adopted by multinational organizations as a standardized internal KPI.

Why do we calculate DART with 200,000 (or 1,000,000 / 100,000)?

  • 200,000 hours is the OSHA base and represents 100 employees working 40 hours/week for 50 weeks/year.
  • 1,000,000 hours is commonly used in international corporate dashboards for easier benchmarking across large organizations.
  • 100,000 hours is sometimes used for smaller sites/projects to avoid very small decimals and improve trend readability.

Best practice: pick one multiplier for your organization and use it consistently for trending and benchmarking.

DART Rate Formula

DART Rate = (Number of DART Cases × Multiplier) ÷ Total Manhours Worked

OSHA default multiplier: 200,000

DART Rate Calculator – Quick & Easy

Enter your DART cases and total manhours worked. Select the multiplier used in your reporting standard. 200,000 hours is recommended to use as per the OSHA but you can select 1 million or 100 K also if you are calculating for your internal requirements.

Result:

Your result will appear here

Worked Example (How to Calculate DART Rate)

Example: A company has 5 DART cases and worked 500,000 manhours in a year.

  • Cases = 5
  • Manhours = 500,000
  • Multiplier = 200,000 (OSHA standard)
DART = (5 × 200,000) ÷ 500,000
DART = 1,000,000 ÷ 500,000
DART = 2.00

Interpretation: A DART rate of 2.00 means that for every 100 full-time equivalent workers, approximately 2 cases involved days away/restricted work/job transfer during the period (when using the OSHA base).

Why Measuring DART Matters

  • Severity-focused insight: DART tracks cases that affect work capability, not minor first-aid events.
  • Benchmarking: Normalizes performance to compare across sites, contractors, and business units.
  • Management focus: Highlights where controls are failing for higher consequence injuries.
  • Audit readiness: Supports consistent safety KPI reporting and governance reviews.

DART vs TRIR/TRIFR (Quick Explanation)

  • TRIR/TRIFR: includes all recordable cases (medical treatment, restricted work, job transfer, days away, and sometimes others depending on your definition).
  • DART: includes only the more impactful subset: Days Away + Restricted Work + Job Transfer.

Many organizations track both: TRIR/TRIFR for overall recordables, and DART for serious work-impacting cases.

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DART Rate FAQ

1) Is DART legally required everywhere?
DART is a formal OSHA recordkeeping KPI in the United States. Outside the USA, it is typically used for internal benchmarking and corporate reporting rather than statutory submission.

2) What counts as a DART case?
A case is counted in DART if it results in days away from work, restricted duty, or job transfer due to a work-related injury/illness (as per OSHA recordkeeping criteria).

3) Should contractors be included?
If your company policy includes contractors in injury reporting, include contractor DART cases and contractor manhours to keep the rate exposure-based and comparable.

4) Which multiplier should I use?
Use 200,000 for OSHA-style reporting. Use 1,000,000 if your organization’s global KPI standard is per million hours. The key is consistency.

References (Primary Sources)

DART Calculator

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