Lost Time Injury Frequency Rate (LTIFR) Calculator
Calculate your organization's safety frequency rate per million hours worked.
1,000,000 (International Standard)
200,000 (OSHA Standard)
Calculation Result:
Your Frequency Rate is: 0.00
Understanding Frequency Rate in Safety
In occupational health and safety (OHS), the Frequency Rate, often referred to as the Lost Time Injury Frequency Rate (LTIFR), is a critical metric used to measure the number of lost-time injuries that occur within a workplace relative to the total number of hours worked by the workforce during a specific period.
This rate allows safety managers and organizations to benchmark their safety performance against industry standards and track improvements over time, regardless of changes in the size of the workforce.
The LTIFR Formula
The standard formula to calculate the safety frequency rate is:
Frequency Rate = (Number of Lost Time Injuries × 1,000,000) / Total Hours Worked
Key Components Explained
Lost Time Injury (LTI): An injury sustained by an employee that results in that person being unable to work the next full workday or shift.
Total Hours Worked: This includes all actual hours worked by all employees, including overtime and training, but excludes leave (annual, sick, or public holidays).
The Multiplier: A constant (usually 1,000,000 or 200,000) used to normalize the data. 1,000,000 represents the hours worked by approximately 500 full-time employees in a year, whereas 200,000 (common in the USA) represents 100 employees.
Example Calculation
Suppose a construction company records 4 lost time injuries over a year. During that year, the total hours worked by all site staff combined was 800,000 hours.
Step
Calculation
Injuries × Multiplier
4 × 1,000,000 = 4,000,000
Divide by Hours
4,000,000 / 800,000 = 5.0
Final Rate
5.0 lost time injuries per million hours worked.
Why is Frequency Rate Important?
Tracking the frequency rate is essential for several reasons:
Trend Analysis: It helps identify if safety performance is improving or declining over time.
Benchmarking: Companies can compare their safety record with other businesses in the same sector.
Regulatory Compliance: Many government bodies and insurance providers require the reporting of these metrics.
Resource Allocation: High frequency rates signal that a department or site needs more safety training or better equipment.
function calculateFrequencyRate() {
var injuries = document.getElementById('lti_count').value;
var hours = document.getElementById('total_hours').value;
var multiplier = document.getElementById('multiplier').value;
var resultDiv = document.getElementById('safetyResult');
var rateSpan = document.getElementById('rateValue');
var textDisplay = document.getElementById('resultText');
// Validation
if (injuries === "" || hours === "" || hours <= 0) {
alert("Please enter valid positive numbers. Total hours must be greater than zero.");
return;
}
var lti = parseFloat(injuries);
var totalHours = parseFloat(hours);
var multi = parseFloat(multiplier);
// Calculation Logic
var frequencyRate = (lti * multi) / totalHours;
var formattedRate = frequencyRate.toFixed(2);
// Display results
rateSpan.innerHTML = formattedRate;
var benchmarkType = (multi == 1000000) ? "per 1,000,000 hours" : "per 200,000 hours";
textDisplay.innerHTML = "This means for every " + multi.toLocaleString() + " hours worked, your organization experiences approximately " + formattedRate + " lost time injuries.";
resultDiv.style.display = 'block';
// Scroll to result smoothly
resultDiv.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}