Injuries requiring medical treatment beyond first aid, restricted work, or days away.
The sum of hours worked by all employees during the specific period.
Please enter valid positive numbers for both fields.
TRIFR: 0.00
function calculateTRIFR() {
// 1. Get Elements
var incidentsInput = document.getElementById('trifr_incidents');
var hoursInput = document.getElementById('trifr_hours');
var resultBox = document.getElementById('trifr_result');
var scoreValue = document.getElementById('trifr_score_value');
var explanationText = document.getElementById('trifr_explanation');
var errorMsg = document.getElementById('trifr_error');
// 2. Parse Values
var incidents = parseFloat(incidentsInput.value);
var hours = parseFloat(hoursInput.value);
// 3. Validation
if (isNaN(incidents) || isNaN(hours) || incidents < 0 || hours <= 0) {
errorMsg.style.display = 'block';
resultBox.style.display = 'none';
return;
}
// 4. Reset Error
errorMsg.style.display = 'none';
// 5. Calculate TRIFR
// Formula: (Incidents * 200,000) / Total Hours
var trifr = (incidents * 200000) / hours;
// 6. Format Result
var formattedTRIFR = trifr.toFixed(2);
// 7. Generate Contextual Message
var context = "With " + incidents + " recordable incidents over " + hours.toLocaleString() + " hours worked, your Total Recordable Incident Frequency Rate is " + formattedTRIFR + ".";
context += "Interpretation: This rate represents the number of injuries per 100 full-time employees over a one-year period. A score of " + formattedTRIFR + " implies that for every 100 employees working a full year, " + formattedTRIFR + " recordable injuries occurred.";
// 8. Update DOM
scoreValue.innerHTML = formattedTRIFR;
explanationText.innerHTML = context;
resultBox.style.display = 'block';
}
Understanding Total Recordable Incident Frequency Rate (TRIFR)
The Total Recordable Incident Frequency Rate (TRIFR), often referred to simply as TRIR, is a standardized safety metric used by the Occupational Safety and Health Administration (OSHA) and safety professionals worldwide. It quantifies a company's safety performance by calculating the number of recordable incidents normalized per 100 full-time workers per year.
Unlike absolute numbers of accidents, TRIFR allows for a fair comparison between companies of different sizes. Whether you have 10 employees or 10,000, the TRIFR provides a scaled benchmark of your safety culture.
The TRIFR Formula
The calculation is based on a standard formula that normalizes injury data:
TRIFR = (Total Recordable Incidents × 200,000) ÷ Total Hours Worked
Why is 200,000 used in the formula?
The constant 200,000 represents the hours worked by 100 full-time employees in one year. This is derived from:
100 employees
Working 40 hours per week
For 50 weeks per year
100 × 40 × 50 = 200,000 hours
By including this constant, the resulting TRIFR score tells you: "If we had exactly 100 people working all year, how many injuries would we have had?"
What Counts as a "Recordable Incident"?
Not every bump or scrape affects your TRIFR. For an incident to be included in the "Total Recordable Incidents" input field, it must meet specific OSHA criteria. Generally, recordable incidents include:
Fatalities.
Injuries resulting in days away from work.
Restricted work activity or job transfer.
Medical treatment beyond basic first aid.
Loss of consciousness.
Significant injuries diagnosed by a physician (e.g., fractured bones, punctured eardrums).
Note: Minor injuries treated solely with first aid (e.g., applying a bandage, using a cold compress) are not included in this calculation.
Example Calculation
Let's look at a realistic scenario for a mid-sized construction company:
Incidents: The company experienced 4 recordable injuries in the past year.
Hours Worked: The total time worked by all employees combined was 450,000 hours.
Using the calculator above:
(4 × 200,000) ÷ 450,000 = 1.78
This company has a TRIFR of 1.78. This means for every 100 full-time employees, approximately 1.78 injuries occurred.
What is a "Good" TRIFR Score?
There is no single "good" number because risk varies drastically by industry. A TRIFR of 3.0 might be considered excellent in high-risk sectors like heavy manufacturing or logging, but it would be considered poor in finance or software development.
To evaluate your score, you should compare it against the BLS (Bureau of Labor Statistics) industry averages for your specific NAICS code. However, the general goal for any safety program is a downward trend, aiming for Zero Harm.