OSHA Incident Rate Calculator
OSHA incident rate calculator computes TRIR, LTIR, DART, severity rate, and LTIFR from your workplace injury cases and total hours worked. Used by HR teams, OSH professionals, and EHS managers to track workplace safety performance, file OSHA Form 300A, benchmark against BLS industry averages, and report lost-time injury frequency rates. Supports the OSHA standard 200,000-hour base and the international 1,000,000-hour LTIFR convention.
OSHA incident rate = (Number of cases x 200,000) divided by total hours worked. The 200,000 hours represents 100 full-time employees working a full year, so the result is incidents per 100 FTE workers. Use TRIR for all recordables, LTIR for lost-time cases, DART for restricted-duty cases, and LTIFR (multiplier 1,000,000) for international reporting.
Enter Values
Pick the OSHA or international metric you need to report.
Recordable injuries, lost-time incidents, or DART cases for the period
Total days away from work, restricted, or transferred. Used for the Severity Rate calculation only.
All hours worked by all employees during the reporting period (typically a year)
Result
Enter values above and click Calculate to see your result.
AI Assistant
Ask about this calculator
I can help you understand the osha incident rate calculator formula, interpret your results, and answer follow-up questions.
Try asking
Formula
How it works: OSHA incident rates normalize injury counts against the size of the workforce. The 200,000 multiplier represents 100 full-time employees working 40 hours per week for 50 weeks (the equivalent of one year of work for 100 people). Dividing by total hours worked then multiplying by 200,000 produces a rate per 100 FTE workers, which is the OSHA reporting standard. International LTIFR uses 1,000,000 hours instead, expressing rates per million hours worked.
Review and Methodology
This calculator runs locally in your browser. Inputs are converted into the units required by the formula, and the result is paired with supporting references so you can verify the method before using it for planning or estimates.
Worked Example
Understanding TRIR, LTIR, DART, and LTIFR for Workplace Safety
OSHA incident rates turn raw injury counts into a number that can be compared across companies and years. The 200,000-hour base is a fixed normalizer, not a real measurement. It represents the labor of 100 full-time workers across one year (100 x 40 x 50). Whatever your headcount, dividing your incident count by your real hours worked then multiplying by 200,000 lets a 50-person site compare directly with a 5,000-person enterprise.
TRIR is the broadest metric. It counts every OSHA-recordable case: any injury that required medical treatment beyond first aid, any case of lost time, any restricted-duty assignment, hearing-loss diagnosis, or fatality. LTIR narrows that to cases where the employee missed at least one full day of work, while DART narrows it to days away, restricted duty, and transfer cases.
Severity Rate uses the same 200,000 multiplier but swaps case count for total lost workdays in the numerator. It is the metric that catches a workplace where there are few injuries but each one is serious. Pair it with TRIR to see frequency and intensity together.
LTIFR is the international cousin of LTIR. Australia, the UK, the EU, and most resource and energy industries report LTIFR per million hours worked. Multiply your LTIR by 5 to convert to LTIFR (because 1,000,000 / 200,000 = 5). World-class operators target LTIFR under 1.0.
The top three drivers of high incident rates are inadequate training, unclear hazard reporting workflows, and gaps between supervisors and frontline crews. Tracking these rates is the first step. Closing the loop with case follow-ups, return-to-work coordination, and predictive analysis is where rates actually come down.
- TRIR formula: (Recordable Cases x 200,000) / Total Hours Worked. BLS private-industry average is around 2.7; below 1.0 is excellent.
- LTIR counts only cases with at least one full day away from work. Always lower than TRIR for the same site.
- DART rate includes Days Away, Restricted duty, or Transferred cases. BLS national average is 1.7.
- Severity Rate replaces case count with total lost workdays to track injury intensity, not just frequency.
- LTIFR uses a 1,000,000-hour multiplier (international standard). Multiply LTIR by 5 to convert.
Use this calculator before filing OSHA Form 300A, during contractor prequalification, or as part of monthly EHS dashboards. Pair it with the Cost Per Hire Calculator and Cost of Bad Hire Calculator to estimate the full financial impact of workplace incidents on your team.
You can also calculate changes using our Workplace Injury Cost Calculator, Cost of Bad Hire Calculator, Employee Turnover Cost Calculator, ROI Calculator or Break-Even Calculator.
TRIR and DART Industry Benchmarks (BLS)
U.S. Bureau of Labor Statistics private-industry TRIR and DART averages by sector. Compare your rate against your specific industry rather than the all-industry figure to set realistic safety targets.
| Industry | TRIR | DART | Notes |
|---|---|---|---|
| All Private Industry (avg) | 2.7 | 1.7 | National baseline reference |
| Agriculture, Forestry, Fishing | 4.6 | 2.6 | High-hazard outdoor and equipment work |
| Construction | 2.5 | 1.5 | Falls, struck-by, electrocution top hazards |
| Manufacturing | 3.3 | 1.6 | Machine guarding and ergonomics drive rates |
| Wholesale Trade | 2.7 | 1.7 | Forklift and material handling injuries |
| Retail Trade | 2.9 | 1.5 | Slips, trips, lifting injuries common |
| Transportation and Warehousing | 4.8 | 3.4 | Highest non-agriculture rate; lifting and vehicle |
| Healthcare and Social Assistance | 4.5 | 2.6 | Patient handling, exposure, workplace violence |
| Information | 0.8 | 0.5 | Office-based, low physical hazard |
| Finance and Insurance | 0.5 | 0.3 | Lowest among major sectors |
| Professional and Business Services | 1.0 | 0.5 | Office work plus field services blended |
| Accommodation and Food Services | 3.0 | 1.4 | Burns, cuts, slips, repetitive motion |
| Public Administration | 3.6 | 2.1 | Includes corrections, fire, public safety |
Note: Source: U.S. Bureau of Labor Statistics, most recent published Survey of Occupational Injuries and Illnesses (SOII). Rates are per 100 full-time equivalent workers. Compare your TRIR and DART against your specific NAICS code, not the all-industry average. Rates fluctuate year to year; track your own trend alongside industry benchmarks. For educational reference only.
Frequently Asked Questions
What is the formula for TRIR?
TRIR = (Number of OSHA recordable cases x 200,000) / Total hours worked. The 200,000 multiplier represents 100 full-time employees working 2,000 hours each per year, so the result expresses incidents per 100 FTE workers. A company with 5 recordable injuries and 500,000 hours worked has a TRIR of (5 x 200,000) / 500,000 = 2.0.
What is a good TRIR rate?
The U.S. Bureau of Labor Statistics private-industry TRIR averages around 2.7. A TRIR below 1.0 is considered excellent and is the target for top-quartile performers. Construction averages 2.5, manufacturing 3.3, healthcare and social assistance 4.5, and warehousing 4.8. Always benchmark against your specific NAICS code rather than the all-industry figure.
How is LTIR different from TRIR?
TRIR counts ALL OSHA-recordable injuries: medical treatment beyond first aid, lost time, restricted duty, fatalities, and significant diagnoses. LTIR (Lost Time Incident Rate) counts only cases where an employee missed at least one full day of work. LTIR is always lower than TRIR for the same workplace and is the metric most commonly used internationally.
How do I calculate LTIFR?
LTIFR (Lost Time Injury Frequency Rate) uses the international 1,000,000-hour convention: LTIFR = (Lost Time Injuries x 1,000,000) / Total hours worked. A site with 3 lost-time injuries and 600,000 hours has an LTIFR of 5.0. Australian Safe Work and UK HSE both use this format. World-class performers report LTIFR below 1.0.
What is the DART rate and how does it differ from TRIR?
DART stands for Days Away, Restricted, or Transferred. The DART rate counts only cases serious enough to require time off, modified duty, or job transfer, which excludes minor recordables that only required medical treatment. Formula: (DART cases x 200,000) / Total hours. DART is always lower than TRIR. The BLS national DART average is around 1.7.
How do I count total hours worked for the formula?
Sum all hours actually worked by every employee during the reporting period: regular time, overtime, and temporary or contract hours that you supervise. Do NOT include vacation, sick leave, holidays, or other paid time not worked. Most employers pull this from payroll. A 50-person site averaging 2,000 productive hours per worker logs 100,000 total hours per year.
What is the severity rate and when should I use it?
The Severity Rate (also called Lost Workday Rate) measures injury severity rather than frequency. Formula: (Total lost workdays x 200,000) / Total hours worked. If your team had 30 lost workdays across 300,000 hours, the severity rate is 20. Track it alongside TRIR to see whether you are reducing both how often injuries occur AND how serious they are.
Can I embed this OSHA Incident Rate Calculator on my website?
Yes. Click the "Embed" button at the top of this page to customize the size, colors, and theme, then copy the iframe code. Paste it into any HTML page, WordPress site, or CMS. It is completely free, requires no signup, and works on all devices. You can also visit our embed guide at calculory.com/services/embed-calculators for more details.
AI Assistant
Ask about this calculator
I can help you understand the osha incident rate calculator formula, interpret your results, and answer follow-up questions.
Try asking
More Business Calculators
View allProfit Maximizing Output Calculator
Find the output level that maximizes profit.
Website Value Calculator
Professional valuation for websites and online businesses.
Web Design Cost Calculator
Estimate website design costs with traditional and AI development options.
App Development Cost Calculator
Estimate mobile app development costs by scope and features.
Related Articles
All articles
Agentic ROI Blueprint: Replacing Roles in 2026
In 2026, teams are measuring total capability, not just headcount. Learn how to model the cost of replacing or augmenting full-time roles with an AI agent stack.
Read article
Circular TCO vs Circular Savings: Payback Blueprint 2026
Compare linear ownership costs against circular savings with a practical 2026 model. Calculate annualized cost, lifetime savings, and payback months for sustainable investments.
Read article
How to Calculate ROI: Formula, Examples, and Free Calculator
Learn how to calculate Return on Investment (ROI) with the standard formula, real-world examples for marketing, real estate, and stocks, and understand the limitations of basic ROI.
Read article
Compound Interest Explained: How Your Money Grows Over Time
Understand how compound interest works with clear examples and visual breakdowns. Learn the formula, see how frequency affects growth, and discover why Einstein called it the eighth wonder of the world.
Read articleModern Tools for Every Need
Secure and Private
All calculations run locally. Your business data never leaves your browser.
Verified Precision
Precise Business Calculations Powered by Calculory AI