LTI & OSHA injury-rate calculator

UNDERSTAND THE METRIC

Definition

OSHA classifies cases by outcome. A days-away case is a recordable work-related injury or illness involving days away from work. “LTI” and “LTIFR” can have different organisational definitions; this tool uses OSHA Form 300 column H for its main days-away rate.

When to use it

Use consistent case and hours totals to review injury and illness experience for the same workforce and reporting period. The result is a frequency rate, not the number of days lost and not a prediction of the next incident.

Formula

Days-away rate = H × 200,000 ÷ hours worked. TRIR/TRC = (G + H + I + J) × 200,000 ÷ hours worked. DART = (H + I) × 200,000 ÷ hours worked.

USE IT CONSISTENTLY

Inputs and interpretation

• G = deaths; H = days-away cases; I = job-transfer/restriction cases; J = other recordable cases. Classify each case once by its most serious outcome. Do not count the same case in both H and I.
• Use number of cases, not calendar days lost. OSHA’s days-away recording rules exclude the day of the incident; check 1904.7 for the full criteria and special situations.
• Use hours actually worked by the same covered workforce during the same period, including overtime. Exclude vacation, holidays, sick leave and other non-work time.
• The 200,000-hour base represents 100 full-time workers × 40 hours × 50 weeks. These are not percentages. A zero rate does not demonstrate absence of hazards.
• The optional one-million-hour value simply rescales the same column-H count. It is a custom comparison, not an OSHA-standard LTIFR definition. Do not compare different bases or case definitions as if they were identical.