TRIR Calculator (OSHA Incident Rate & DART Rate Calculator)
Calculate OSHA TRIR, DART Rate, LTIR and workplace safety incident metrics instantly using official OSHA formulas. Estimate total recordable incident rates, lost time injury rates and safety performance indicators for compliance reporting.
Results will appear here automatically after entering workplace safety data.
TRIR Calculator – OSHA Incident Rate & DART Rate Calculator
This free TRIR Calculator helps safety managers, construction companies, manufacturing businesses, industrial facilities, compliance officers and workplace safety teams calculate OSHA incident rates instantly using official OSHA formulas. The calculator supports Total Recordable Incident Rate (TRIR), DART Rate, LTIR and other workplace safety metrics used for OSHA compliance reporting and contractor qualification.
Companies commonly search for terms such as TRIR calculator, OSHA incident rate calculator, DART rate calculator, OSHA TRIR calculator, total recordable incident rate calculator, OSHA injury rate calculator and incident rate formula. This calculator combines all of those workplace safety calculations into one mobile-friendly interface designed for modern OSHA reporting and safety management.
TRIR and DART rates are widely used across the United States to evaluate workplace safety performance and monitor OSHA recordable incidents. Many contractors, insurance providers and large organizations use these metrics when reviewing vendor safety records and compliance standards.
What Is TRIR?
TRIR stands for Total Recordable Incident Rate. It is one of the most commonly used OSHA workplace safety metrics for measuring recordable incidents relative to employee labor hours worked.
OSHA TRIR Formula
TRIR = (Recordable Incidents × 200,000) ÷ Total Employee Hours Worked
The OSHA base number of 200,000 represents the approximate hours worked by 100 full-time employees during one year. OSHA incident rate formulas use this standardized value to create consistent comparisons between organizations of different sizes.
How To Use This OSHA Incident Rate Calculator
This OSHA incident rate calculator is designed for workplace safety reporting, OSHA compliance analysis, contractor prequalification and internal safety performance tracking.
- Enter total OSHA recordable incidents.
- Enter total DART incidents if applicable.
- Add lost time injury cases.
- Enter total lost work days.
- Enter total employee hours worked.
- Review TRIR, DART Rate, LTIR and Severity Rate instantly.
TRIR Calculation Example
Imagine a manufacturing company recorded 5 OSHA recordable incidents during the year while employees worked a combined total of 400,000 hours.
TRIR = (5 × 200,000) ÷ 400,000
TRIR = 2.5
This means the organization experienced 2.5 OSHA recordable incidents per 100 full-time employees during the reporting period.
DART Rate Explained
DART stands for Days Away, Restricted or Transferred. The DART rate focuses specifically on more serious OSHA recordable incidents that caused employees to miss work, work under restrictions or transfer to another role.
OSHA DART Formula
DART Rate = (DART Cases × 200,000) ÷ Total Employee Hours Worked
Safety managers often compare DART rates against TRIR values to evaluate incident severity and operational safety performance. In many industries, a lower DART rate may indicate fewer severe injuries and better workplace safety management.
What Is LTIR?
LTIR stands for Lost Time Injury Rate. This metric measures incidents that resulted in employees missing work because of occupational injuries or illnesses. LTIR is commonly used in manufacturing, construction, mining, logistics and industrial operations.
LTIR Formula
LTIR = (Lost Time Injuries × 200,000) ÷ Employee Hours Worked
Common OSHA Safety Metrics
| Safety Metric | Meaning | Common Use |
|---|---|---|
| TRIR | Total Recordable Incident Rate | Overall OSHA incident tracking |
| DART Rate | Days Away, Restricted or Transferred incidents | Severity-focused safety analysis |
| LTIR | Lost Time Injury Rate | Lost workday incident tracking |
| Severity Rate | Total lost workdays per 100 employees | Injury impact analysis |
OSHA 300 Log & Incident Reporting
Most organizations calculate OSHA incident rates using information from OSHA 300 and OSHA 300A logs. These logs track recordable workplace injuries, illnesses, restricted work cases and days away from work during the reporting year. OSHA and BLS guidance recommend using actual employee hours worked while excluding vacation, leave and non-working paid hours.
Many organizations use OSHA incident rates during:
- Contractor prequalification reviews
- Insurance risk analysis
- OSHA compliance reporting
- Workplace safety benchmarking
- Vendor qualification screening
- Internal safety improvement programs
Industry Average TRIR Benchmarks
A good TRIR varies depending on industry risk levels. Construction, manufacturing and oil & gas industries typically report higher average TRIR values than office or professional service businesses.
| Industry | Typical TRIR | Safety Risk Level |
|---|---|---|
| Office & Professional Services | Below 1.0 | Low |
| Manufacturing | 2.0 – 4.0 | Moderate |
| Construction | 3.0 – 6.0 | Higher Risk |
| Oil & Gas | 1.0 – 3.0 | Moderate |
Benefits Of This TRIR Calculator
- Calculate OSHA TRIR instantly
- Supports DART Rate and LTIR calculations
- Mobile-friendly workplace safety tool
- Includes copy, print, export and sharing tools
- Free with no login or registration required
- Client-side calculations for privacy
- Useful for OSHA reporting and contractor compliance
- Fast calculations for safety managers and EHS teams
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Frequently Asked Questions
How do you calculate TRIR?
Multiply total OSHA recordable incidents by 200,000 and divide by total employee hours worked during the reporting period.
What is considered a good TRIR?
Lower TRIR values generally indicate stronger workplace safety performance, although acceptable ranges vary by industry and operational risk levels.
What does DART rate mean?
DART rate measures OSHA incidents involving days away, restricted duty or transferred employees.
Is this OSHA incident rate calculator free?
Yes. This workplace safety calculator is completely free with no registration or login required.
Does this calculator store company safety information?
No. All calculations run locally in your browser and no incident data is sent to our servers.
Can this calculator be used for OSHA 300 reporting?
Yes. The formulas are based on OSHA-standard incident rate calculations commonly used with OSHA 300 and OSHA 300A reporting data.