Lost Time Injury Frequency Rate Ltifr Calculation

LTIFR Calculator

1,000,000 Hours (International Standard) 200,000 Hours (US OSHA Standard)

Calculation Results

Understanding Lost Time Injury Frequency Rate (LTIFR)

The Lost Time Injury Frequency Rate (LTIFR) is a fundamental safety metric used by Health, Safety, and Environment (HSE) professionals to measure the number of lost time injuries that occur within a workplace relative to the total number of hours worked by the workforce.

The LTIFR Formula

LTIFR = (Number of LTIs × Multiplier) / Total Hours Worked

Key Components:

• Lost Time Injury (LTI): An injury sustained by an employee while at work that results in the person being unable to perform their duties for at least one full day or shift following the day of the incident.
• Total Hours Worked: This includes the actual hours worked by employees, including overtime and training, but excluding leave, sickness, or public holidays.
• Multiplier:
  • 1,000,000: Typically used globally (Australia, Europe) representing the rate per million hours worked.
  • 200,000: Commonly used in the United States, representing the rate per 100 full-time workers (working 40 hours per week, 50 weeks per year).

Example Calculation

If a manufacturing plant has 5 Lost Time Injuries in a year and the total man-hours worked by all staff amounts to 850,000 hours, the LTIFR (using the 1,000,000 multiplier) would be:

(5 × 1,000,000) / 850,000 = 5.88

This means for every million hours worked, there are approximately 5.88 injuries resulting in lost time.

Why is LTIFR Important?

LTIFR serves as a lagging indicator. While it doesn't predict future accidents, it allows companies to:

1. Benchmark safety performance against industry peers.
2. Identify trends in workplace safety over time.
3. Evaluate the effectiveness of safety management systems and training programs.
4. Meet regulatory and reporting requirements for various jurisdictions.