# TRIR and DART rate calculator

> Get your TRIR and DART rates: OSHA-recordable cases times 200,000, divided by hours worked.

Source: https://incidentkit.ai/tools/trir-dart-calculator · Updated Oct 5, 2026

Free, runs in your browser: https://incidentkit.ai/tools/trir-dart-calculator

## How to use it

1. Count the OSHA-recordable cases on your 300 log for the year.
2. Add up the hours your employees actually worked, not paid hours or vacation.
3. For DART, count cases with days away, restricted work or job transfer.
4. Compare with your own past years first. Benchmarks vary by industry (NAICS code).

## Frequently asked questions

### Why 200,000 hours?

It is the hours 100 full-time employees work in a year: 100 people × 40 hours × 50 weeks. That gives a rate per 100 full-time workers a year, so sites of different sizes can be compared.

### What counts as hours worked?

Hours actually worked by all employees, including temporary and seasonal staff you supervise. Leave out vacation, sick leave and holidays. If you lack exact figures, OSHA's Form 300A instructions explain how to estimate.

### Is a lower TRIR always better?

No. A low rate can mean a safe workplace or under-reporting. Pair it with near-miss volume and how fast corrective actions close. A healthy reporting culture often shows more near misses, not fewer.

## Sources

- [OSHA: Recordkeeping handbook and Form 300A instructions](https://www.osha.gov/recordkeeping)
- [BLS: Survey of Occupational Injuries and Illnesses](https://www.bls.gov/iif/)

## Related

- [TRIR and DART rates: formula, example and BLS 2024 rates](https://incidentkit.ai/compliance/osha/trir-and-dart-rates)
- [TRIR (total recordable incident rate): definition and meaning](https://incidentkit.ai/glossary/trir)
- [DART rate: definition and meaning](https://incidentkit.ai/glossary/dart-rate)
- [OSHA 300 Log: how to fill it out, column by column](https://incidentkit.ai/compliance/osha/osha-300-log)
- [Manufacturing incident reporting and OSHA 300 software](https://incidentkit.ai/solutions/manufacturing)