Preview
Enter your manufacturing safety data to calculate TRIR, compare against target values, evaluate severity, and export the result summary.
This preview graph uses sample values until you submit the form.
Calculator Input
Example Data Table
Sample manufacturing safety data for quarterly review and benchmarking.
| Period | Recordable Incidents | Total Hours Worked | Lost Time Cases | Restricted Cases | Target TRIR | TRIR |
|---|---|---|---|---|---|---|
| Q1 2025 | 2 | 165,000 | 1 | 0 | 2.50 | 2.42 |
| Q2 2025 | 1 | 172,500 | 0 | 1 | 2.50 | 1.16 |
| Q3 2025 | 3 | 180,000 | 1 | 1 | 2.50 | 3.33 |
| Q4 2025 | 2 | 190,000 | 0 | 1 | 2.50 | 2.11 |
Formula Used
Primary TRIR Formula
TRIR = (Recordable Incidents × Base Hours) ÷ Total Hours Worked
The standard base hours value is 200,000, representing 100 workers at 40 hours each week for 50 weeks.
DART Rate Formula
DART Rate = ((Lost Time Cases + Restricted Cases) × Base Hours) ÷ Total Hours Worked
Use this to measure cases that caused days away, restricted work, or both.
LTIR Formula
LTIR = (Lost Time Cases × Base Hours) ÷ Total Hours Worked
LTIR isolates the rate of injuries or illnesses that caused time away from work.
This calculator also estimates incidents per 100 workers, hours per recordable case, recordable share of total reported events, contractor impact, and period-over-period change.
How to Use This Calculator
- Enter the reporting period name for your safety review.
- Add your total recordable incidents and total hours worked.
- Keep the standard base at 200,000 unless your policy differs.
- Enter lost time, restricted duty, medical treatment, first aid, and near-miss counts.
- Fill in previous TRIR and target TRIR to compare progress.
- Add contractor data and enable the checkbox if contractor exposure should be included.
- Press Calculate TRIR to display the result above the form.
- Use the CSV or PDF buttons to export the calculated summary.
FAQs
1. What does TRIR measure?
TRIR measures how many OSHA-recordable incidents occur for a normalized labor exposure level. It helps compare safety performance across periods, plants, or contractors despite different total hours worked.
2. Why is 200,000 used in the formula?
The 200,000 multiplier represents 100 full-time employees working 40 hours per week for 50 weeks. It standardizes incident rates so different operations can be compared consistently.
3. Should contractor hours be included?
Include contractor hours when your safety reporting scope treats contractors as part of site exposure. Excluding them can understate the rate if contractor labor contributed to recordable cases.
4. What is the difference between TRIR and LTIR?
TRIR counts all recordable incidents. LTIR only counts incidents that caused lost work time. LTIR is narrower, while TRIR gives a broader view of recordable safety performance.
5. What is DART and why is it useful?
DART stands for days away, restricted, or transferred. It highlights more disruptive incidents and helps safety managers focus on cases that affect workforce availability and productivity.
6. Can TRIR be used for monthly reporting?
Yes. TRIR can be calculated monthly, quarterly, or annually as long as incidents and hours worked cover the same time period. Trend analysis becomes more useful when intervals stay consistent.
7. What does a lower TRIR mean?
A lower TRIR generally means fewer recordable incidents for the amount of labor exposure. It often suggests stronger safety controls, though root-cause quality and reporting consistency still matter.
8. Is TRIR enough by itself?
No. TRIR is helpful, but it should be reviewed with DART, LTIR, near misses, severity trends, corrective action closure, and audit findings for a fuller manufacturing safety picture.