# LTIR (lost-time injury rate)

> LTIR (lost-time injury rate) counts injuries that cost workdays per set block of hours. OSHA does not use the term, so confirm the formula before you compare.

Source: https://incidentkit.ai/glossary/ltir · Updated Oct 5, 2026

Also known as: LTIR, lost time injury rate, lost-time case rate

## The formula and its limits

OSHA publishes no rate named LTIR. Its rule counts cases with days away from work. OSHA and BLS figure rates as cases × 200,000 ÷ hours worked. So a U.S.-style LTIR is days-away cases × 200,000 ÷ hours.

That base is a habit, not a law. Customers, insurers, parent companies and other countries may define lost time and the hours base differently. Label every figure, for example 'LTIR per 200,000 hours'.

Example: 2 lost-time cases and 400,000 hours. 2 × 200,000 = 400,000. Divide by 400,000 to get 1.0.

## What changes the number

- Days: OSHA counts calendar days (weekends too) from the day after the injury. Cap: 180.
- Restricted duty: [DART](https://incidentkit.ai/glossary/dart-rate) includes it. Lost-time rates usually do not.
- Hours base: to restate a rate on B hours as per 200,000, multiply by 200,000 ÷ B.
- A rate per 1,000,000 hours becomes per 200,000 when you multiply by 0.2.

Mix-up: LTIR, [TRIR](https://incidentkit.ai/glossary/trir) and DART answer different questions. TRIR counts all recordable cases. DART counts days away plus restricted and transferred cases. LTIR is narrower: only cases where the employee was away from work.

## Frequently asked questions

### Is LTIR an OSHA metric?

No. OSHA's rates are the total case rate and the DART rate, both on 200,000 hours. LTIR is an industry label, so check how each customer or contract defines it.

### How do I convert an LTIR to a per-200,000-hour rate?

Multiply it by 200,000 divided by the hours base it used. For a rate per 1,000,000 hours, multiply by 0.2. Only convert if both count the same cases.

### Does LTIR include restricted duty cases?

Usually not. Lost time means the employee was away from work. Restricted work and job transfer count in OSHA's DART rate instead. Say which cases your LTIR includes.

## Sources

- [OSHA 29 CFR 1904.7: General recording criteria](https://www.osha.gov/laws-regs/regulations/standardnumber/1904/1904.7)
- [OSHA: Establishment-specific injury and illness data (rate definitions)](https://www.osha.gov/Establishment-Specific-Injury-and-Illness-Data)
- [BLS Handbook of Methods: Survey of Occupational Injuries and Illnesses, calculation](https://www.bls.gov/opub/hom/soii/calculation.htm)

## Related terms

- [Lost-time injury](https://incidentkit.ai/glossary/lost-time-injury)
- [DART rate](https://incidentkit.ai/glossary/dart-rate)
- [TRIR (total recordable incident rate)](https://incidentkit.ai/glossary/trir)
- [OSHA recordable injury](https://incidentkit.ai/glossary/osha-recordable)

## Related

- [TRIR and DART rates: formula, example and BLS 2024 rates](https://incidentkit.ai/compliance/osha/trir-and-dart-rates)
- [TRIR and DART rate calculator (OSHA formula)](https://incidentkit.ai/tools/trir-dart-calculator)
- [Recordable vs first aid: OSHA's medical treatment test](https://incidentkit.ai/compliance/osha/recordable-vs-first-aid)
- [OSHA recordkeeping guide: Part 1904 for employers](https://incidentkit.ai/guides/osha-recordkeeping-guide)