How to Calculate Lost Time Incident Rate

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Understanding and Calculating the Lost Time Incident Rate (LTIR)

The Lost Time Incident Rate (LTIR), also known as the Lost Workday Incident Rate, is a key performance indicator (KPI) used in occupational health and safety to measure the frequency of workplace injuries that result in an employee being unable to work their regularly scheduled shift.

Why is LTIR Important?

Tracking LTIR helps organizations identify trends in workplace safety, assess the effectiveness of their safety programs, and benchmark their performance against industry standards. A high LTIR can indicate underlying safety issues that need to be addressed, potentially leading to increased costs, reduced productivity, and damage to employee morale.

How to Calculate LTIR

The formula for calculating LTIR is as follows:

LTIR = (Number of Lost Time Incidents × 200,000) / Total Number of Hours Worked

The '200,000' in the formula represents the number of hours 100 employees would work in a 40-hour week for a full year (100 employees × 40 hours/week × 50 weeks/year = 200,000 hours). This standardizes the rate, allowing for comparisons across different company sizes and working hours.

  • Number of Lost Time Incidents: This is the total count of incidents that resulted in an employee missing at least one full scheduled workday.
  • Total Number of Hours Worked: This is the sum of all hours worked by all employees during the period being measured (e.g., a month, quarter, or year).

Using the Calculator

To use the calculator below, simply input the required information:

  1. Enter the total Number of Lost Time Incidents for the period.
  2. Enter the Total Hours Worked by all employees during the same period.
  3. Click "Calculate LTIR" to see your Lost Time Incident Rate.

LTIR Calculator

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