Calculator Input Form
Use the calculator for monthly, quarterly, or annual manufacturing safety reviews.
Example Data Table
| Plant | Hours Worked | Recordable Cases | Lost Time Cases | Restricted Cases | Days Away | Restricted Days |
|---|---|---|---|---|---|---|
| Assembly Unit A | 180000 | 4 | 1 | 1 | 14 | 9 |
| Packaging Unit B | 135000 | 3 | 1 | 0 | 12 | 4 |
| Maintenance Unit C | 85000 | 2 | 1 | 1 | 19 | 15 |
Formula Used
Total Recordable Incident Rate (TRIR) = (Recordable Cases × 200000) ÷ Hours Worked
Lost Time Injury Rate (LTIR) = (Lost Time Cases × 200000) ÷ Hours Worked
DART Rate = ((Lost Time Cases + Restricted Transfer Cases) × 200000) ÷ Hours Worked
Severity Rate = ((Days Away + Restricted Days) × Severity Base) ÷ Hours Worked
Injuries per 100 Workers = (Total Injuries ÷ Average Employees) × 100
Near Miss Ratio = Near Misses ÷ Recordable Cases
The 200000 constant represents 100 full-time workers working 40 hours weekly for 50 weeks yearly.
How to Use This Calculator
- Enter a reporting period label for your safety review.
- Input total hours worked during that period.
- Add total injuries, recordables, lost time cases, and restricted cases.
- Enter total days away and restricted duty days.
- Optional fields let you compare against a benchmark and estimate direct cost.
- Press the calculate button to display results above the form.
- Review the graph, then export the summary as CSV or PDF.
Frequently Asked Questions
1. What does TRIR measure?
TRIR measures recordable workplace incidents relative to hours worked. It standardizes injury performance so different departments, plants, or years can be compared fairly.
2. Why is 200000 used in the formula?
It represents 100 full-time employees working 40 hours per week for 50 weeks. That constant makes injury rates easier to compare across organizations.
3. What is the difference between TRIR and LTIR?
TRIR counts all recordable cases. LTIR only counts injuries that caused lost work time. LTIR is narrower and highlights more serious disruptions.
4. What does DART include?
DART includes cases with days away, restricted work, or job transfer. It helps show operational impact beyond general recordables.
5. Can I use this monthly or quarterly?
Yes. The calculator works for any period if your hours worked and case counts match that same reporting window.
6. What is a good near miss ratio?
A higher near miss reporting ratio often suggests stronger reporting culture. It is not a final safety score, but it can reveal proactive hazard reporting.
7. Should contractors be included?
Include them only if your safety program and reporting scope count contractor hours and incidents. Keep the scope consistent for valid comparisons.
8. Does this calculator replace compliance reporting?
No. It supports internal analysis and planning. Official compliance submissions still require your approved reporting process and recordkeeping rules.