TRIR Rate Calculator

Advanced TRIR Rate Form

Recordable Cases

Employee Hours Worked

Contractor Hours

Lost Time Cases

DART Cases

Lost Workdays

Near Misses

Average Workers

Reporting Months

Target TRIR

Rate Multiplier

Scope Note

Include contractor hours in exposure hours

Formula Used

TRIR = Recordable Cases × 200,000 ÷ Total Hours Worked

LTIR = Lost Time Cases × 200,000 ÷ Total Hours Worked

DART Rate = DART Cases × 200,000 ÷ Total Hours Worked

Severity Rate = Lost Workdays × 200,000 ÷ Total Hours Worked

The default multiplier is 200,000. It represents 100 full time workers, working 40 hours per week, for 50 weeks.

How To Use This Calculator

Enter the confirmed recordable cases for the reporting period.
Enter total employee hours worked for the same period.
Add contractor hours only when your report scope includes them.
Enter lost time cases, DART cases, and lost workdays.
Set a target TRIR for gap analysis.
Press the calculate button to view results above the form.
Use CSV or PDF export for reporting and review.

Example Data Table

Scenario	Recordable Cases	Hours Worked	Lost Time Cases	DART Cases	TRIR	LTIR	DART Rate
Manufacturing Site	4	410,000	1	2	1.95	0.49	0.98
Construction Project	3	250,000	1	2	2.40	0.80	1.60
Warehouse Team	2	180,000	1	1	2.22	1.11	1.11

Understanding TRIR Rate

TRIR means total recordable incident rate. It compares recordable cases with total work exposure. The exposure is measured in hours. This makes the result fair across teams, projects, and sites. A large site may have more cases. It also has more hours. TRIR balances both values in one rate.

Why This Calculator Helps

Safety reports often need more than one number. This tool gives TRIR, LTIR, DART, and severity rate together. It also estimates target gaps. You can see how many cases fit a selected target. You can also see how many more hours are needed, when case counts stay unchanged. These options support audits, monthly reviews, and project closeout reports.

Physics Link

The calculator uses the same rate idea used in physics. Events are divided by exposure. Then the result is scaled by a constant. Here, the standard constant is 200,000 hours. It represents 100 workers, working 40 hours weekly, for 50 weeks. This normalized base lets different workplaces be compared on equal ground.

Interpreting Results

A lower TRIR usually shows fewer recordable cases per standard exposure. A lower LTIR shows fewer lost time cases. DART rate includes days away, restricted duty, or transfer cases. Severity rate uses lost workdays. It shows how serious incidents were, not only how often they happened. Use all measures together. One low value can hide another risk.

Good Data Practices

Enter only confirmed recordable cases. Use total hours for employees and selected contractors, if your report includes them. Keep the same reporting scope each month. Do not mix annual hours with monthly cases unless that is your intended period. Review rounding rules before sending final data. Add location, crew, and project notes when records allow it. Notes explain sudden changes. They also help managers find weak controls. Share results with supervisors before posting targets. A quick review catches entry errors, missing hours, duplicate cases, and wrong reporting periods before final release date.

Using the Output

Download the CSV for spreadsheets. Download the PDF for simple sharing. Keep notes about assumptions. Compare results with internal targets. Check trends over time. The calculator is a planning aid. It is not a legal ruling. Confirm final reporting rules with your safety lead.

FAQs

What does TRIR mean?

TRIR means total recordable incident rate. It shows recordable workplace cases per standard 200,000 hours worked.

Why is 200,000 used?

It represents 100 full time workers, working 40 hours weekly, for 50 weeks. It standardizes exposure.

What counts as recordable cases?

Use confirmed recordable injuries or illnesses under your reporting rules. Do not include unverified or duplicate cases.

Should contractor hours be included?

Include contractor hours only when contractors are part of your reporting scope. Keep the same method every period.

What is LTIR?

LTIR means lost time incident rate. It measures lost time cases against the same exposure hour base.

What is DART rate?

DART rate covers cases with days away, restricted duty, or job transfer. It adds useful injury impact context.

Why use severity rate?

Severity rate considers lost workdays. It helps show incident seriousness, not only how often cases occurred.

Can this replace official reporting advice?

No. It is a calculation aid. Confirm final classifications, reporting scope, and submission rules with your safety lead.