Calculate Lost Time Incident Rate

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Calculate Lost Time Incident Rate (LTIR)

Total number of incidents resulting in time away from work.
Total hours worked by all employees during the period.
Please enter valid positive numbers for both fields.
Lost Time Incident Rate (LTIR)
0.00
Incidents per 100 workers (per year)
function calculateLTIR() { // Retrieve input values var incidentsInput = document.getElementById('lti_incidents'); var hoursInput = document.getElementById('total_hours'); var resultContainer = document.getElementById('result_container'); var resultValue = document.getElementById('ltir_result'); var errorMsg = document.getElementById('error_message'); // Parse values var incidents = parseFloat(incidentsInput.value); var hours = parseFloat(hoursInput.value); // Validation logic if (isNaN(incidents) || isNaN(hours) || incidents < 0 || hours <= 0) { errorMsg.style.display = 'block'; resultContainer.style.display = 'none'; return; } // Hide error if validation passes errorMsg.style.display = 'none'; // Calculation Logic: (Incidents * 200,000) / Total Hours // 200,000 is the OSHA standard representing 100 employees working 40 hours/week for 50 weeks. var constant = 200000; var ltir = (incidents * constant) / hours; // Display Result resultValue.innerHTML = ltir.toFixed(2); resultContainer.style.display = 'block'; }

Understanding Lost Time Incident Rate (LTIR)

The Lost Time Incident Rate (LTIR), often referred to as LTR, is a critical Key Performance Indicator (KPI) in environmental, health, and safety (EHS) management. It measures the number of lost time incidents occurring in a workplace per 100 full-time equivalent employees over a specific period, usually one year.

This metric allows companies to assess their safety performance standardized against the size of their workforce, enabling fair comparisons between different departments, sites, or even against industry averages.

The LTIR Formula

The standard formula used by OSHA (Occupational Safety and Health Administration) and safety professionals worldwide is:

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

Here is a breakdown of the components:

  • Number of Lost Time Incidents: This refers to the total count of work-related incidents that resulted in an employee being unable to return to work on their next scheduled shift.
  • Total Hours Worked: The sum of all actual hours worked by all employees during the reporting period. This includes overtime but excludes vacation, sick leave, or holidays.
  • 200,000: This constant represents the equivalent of 100 full-time employees working 40 hours a week for 50 weeks a year (100 × 40 × 50 = 200,000).

Why Calculate LTIR?

Tracking your Lost Time Incident Rate is essential for several reasons:

  1. Safety Benchmarking: It provides a standardized number that helps organizations compare their safety record against past performance or industry peers.
  2. Lagging Indicator: While it measures past events, a high LTIR indicates systemic safety issues that need immediate attention.
  3. Insurance and Bidding: Lower LTIR scores can lead to reduced insurance premiums and are often a requirement when bidding for contracts in industrial sectors like construction or manufacturing.

Example Calculation

To understand how the calculator works, let's look at a realistic scenario for a mid-sized manufacturing plant.

Scenario:
A company has experienced 3 lost time incidents in the past year. During that same year, their entire workforce logged a total of 450,000 hours worked.

Step-by-Step Calculation:

  • Multiply the number of incidents by the constant: 3 × 200,000 = 600,000
  • Divide the result by the total hours worked: 600,000 / 450,000
  • Result: 1.33

An LTIR of 1.33 means that for every 100 full-time employees, approximately 1.33 lost time incidents occurred during that year.

What is Considered a Lost Time Incident?

Not all injuries count toward this metric. A Lost Time Incident (LTI) specifically requires that the injury was:

  • Work-related.
  • Severe enough that the employee could not return to work to perform their routine duties on the next scheduled workday.

Minor injuries treated with first aid where the employee returns to work immediately do not impact the LTIR; these might be tracked in a separate TRIR (Total Recordable Incident Rate) calculation.

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