DART Rate Calculator
Compute the DART rate (Days Away, Restricted, or Transferred): DART = qualifying injury cases x 200,000 / total hours — the frequency of severe injuries.
輸入資料
計算結果
重點速覽：DART (Days Away, Restricted, or Transferred) measures the frequency of 'severe' work injuries — those causing time away, restricted duty, or transfer. DART rate = (DART cases x 200,000) / total hours; 200,000 = 100 FTEs x 2,000 hrs, so the rate = cases per 100 FTEs per year. DART is the severe subset of TRIR, so DART ≤ TRIR. WARNING: 'recordable/DART' follows professional standards (e.g. OSHA); HK Labour Department criteria may differ. Education, not advice.
計算公式
DART 率 = (DART 工傷案件數 × 200,000) ÷ 總工時。
200,000 = 100 名全職員工 × 每年約 2,000 工時的標準化基準。
結果代表每 100 名全職員工每年發生的 DART 工傷宗數。
$$DART = \dfrac{DART\ cases \times 200{,}000}{Total\ hours\ worked}$$$$DART \leq TRIR$$使用說明
- Enter the DART injury case count.
- Enter total hours worked.
- View the standardised DART rate.
總工時固定 250,000 小時 (約 125 名全職員工一年) 下，不同 DART 工傷宗數對應的 DART 率
| DART 工傷 (宗) | 總工時 | DART 率 | 解讀 |
|---|---|---|---|
| 1 | 250,000 | 0.80 | 表現良好 |
| 3 | 250,000 | 2.40 | 中等 |
| 5 | 250,000 | 4.00 | 偏高需關注 |
| 8 | 250,000 | 6.40 | 高風險 |
理財情境案例
案例一：計算公司年度 DART 率
某物流公司一年內有 5 宗導致誤工或工作受限的工傷，全體員工總工時 250,000 小時 (約 125 名全職員工)。
DART 率 = (5 × 200,000) ÷ 250,000 = 1,000,000 ÷ 250,000 = 4.00。
DART 率為 4，相當於每 100 名全職員工一年約發生 4 宗較嚴重的工傷。這些是真正影響員工出勤與生產力的案件;若同行業平均約 2.5，則此公司偏高，應優先排查造成誤工的高危工序。
案例二：用 DART 佔 TRIR 比例判斷嚴重度
同一公司同期 TRIR 為 6.4 (即 8 宗可記錄工傷)，DART 率為 4.0 (其中 5 宗屬 DART)。
DART 佔 TRIR 比例 = 4.0 ÷ 6.4 = 62.5%；亦即 5 ÷ 8 = 62.5% 的可記錄工傷屬較嚴重案件。
超過六成工傷嚴重到造成誤工或工作受限，比例偏高，是高後果風險的警號。相較於『小傷多、大傷少』的公司，此公司更應聚焦於防範嚴重事故 — 例如針對高危工序做工程控制、加強高風險崗位防護，而非只減少輕微擦傷的數量。
常見問題
What is the DART rate and how is it computed?
DART is an occupational-safety core metric: Days Away, Restricted, or Transferred — injuries severe enough to cause leave (Days Away), limited duties (Restricted), or reassignment (Transferred). Formula: DART rate = (DART cases x 200,000) / total hours. The 200,000 constant = 100 full-time employees x 2,000 hours/year, standardising all firms to 'per 100 FTEs per year'. Example: 5 cases, 250,000 hours → (5 x 200,000)/250,000 = 4, i.e. ~4 severe injuries per 100 FTEs per year.
How is DART different from TRIR?
Same formula (cases x 200,000 / hours) but different numerator. TRIR covers ALL recordable injuries/illnesses (any needing more than first aid, lost consciousness, diagnosed occupational illness), regardless of severity. DART counts only the severe subset (days away, restricted, or transferred). So every DART case is recordable (in TRIR) but not vice versa (a minor injury needing simple treatment, employee works normally, is in TRIR not DART). Thus DART ≤ TRIR. TRIR shows overall frequency; DART focuses on injuries with real impact. Track both: high TRIR but low DART = many minor, few severe; high DART/TRIR ratio = severe cases dominate, warrant attention.
What is a good DART rate, and caveats?
No one-size-fits-all standard — risk varies hugely by industry (construction/manufacturing/logistics naturally higher than office). Compare with industry benchmark, not across industries; lower is better; track your own trend over time. Caveats: (1) use correct definitions per OSHA etc.; (2) total hours must be accurate (exclude leave); (3) small firms' rates swing wildly on one case; (4) it is a lagging indicator — pair with leading ones (inspections, near-miss reporting). For formal reporting, follow the local authority (HK Labour Department).
What does DART/TRIR ratio reveal?
DART divided by TRIR is a 'severity' indicator — what share of recordable injuries were severe. Example TRIR 4, DART 1.5 → 37.5% of recordables were severe. Read cases: high TRIR, low DART ratio = many minor; low TRIR but high DART ratio = infrequent but severe (high-consequence risk like falls, machinery) — prioritise engineering controls. Small-firm ratios swing; watch multi-period averages; it is lagging, so pair with leading indicators.
Which injuries count as DART, and how to count days?
A case counts if it causes any ONE of: (1) Days Away — couldn't work, took leave (even one day after the injury); (2) Restricted work — returned but can't do all normal duties (e.g. no heavy lifting); (3) Transferred — reassigned due to injury. Simple-treatment-and-normal-work cases are recordable (TRIR) but not DART. Day counting: typically from the day AFTER the injury (calendar days, not work days), often capped (e.g. 180 days). Note the DART numerator counts CASES, not total lost days (days feed other severity metrics). Follow the local authority (HK Labour Department) for classification.
相關工具
參考資料
內容審核：香港計算器財經團隊。計算邏輯與公式參考香港金融管理局（HKMA）及投資者及理財教育委員會（IFEC）之個人理財計算指引，結果僅供參考，實際以相關機構公佈為準。