FOR EHS COORDINATORS, SAFETY MANAGERS AND CONTRACTORS

What is your TRIR actually going to say on that prequalification form?

Turn the counts already on your OSHA 300 log into your Total Recordable Incident Rate and DART rate — the two numbers a GC's prequalification form, a bid package, or an insurance renewal actually asks for — and see how many more injury-free hours it takes to bring the rate down to the ceiling they set.

How to calculate TRIR (with the OSHA formula and a worked example) · This calculator vs. a spreadsheet · Asbestos abatement bid calculator for pricing the job this rate gets reported against

This period's counts

From your own OSHA 300 log for the period you're reporting — a calendar year for the 300A summary, or any period a bid form asks for.

DART cases are the recordable cases that involved Days Away, Restricted duty, or a job Transfer — a subset of recordable cases, never more than the total. Target TRIR is whatever ceiling you're being measured against: a GC's prequalification cutoff, your trade's published industry average, or your own goal.

TRIR this period

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The form opens on a worked example. Change the counts and hours to your own and press the button.

Common questions

What is TRIR?

TRIR (Total Recordable Incident Rate) is the number of OSHA-recordable injuries and illnesses per 100 full-time workers per year: recordable cases times 200,000, divided by total hours worked by all employees. 200,000 is OSHA's own base rate — the hours 100 full-time employees work in a year (40 hours a week, 50 weeks) — so the rate is comparable across companies of any size.

What is DART rate?

DART rate uses the same formula as TRIR but counts only cases involving Days Away from work, Restricted duty, or job Transfer — the recordable cases serious enough to keep someone from doing their normal job. It is always less than or equal to TRIR, because every DART case is also a recordable case, but not every recordable case is a DART case (a case needing only medical treatment beyond first aid is recordable but not DART).

Does this tool decide whether an injury is OSHA recordable?

No. Recordability is a judgment call made against OSHA's own recordkeeping rule (29 CFR 1904.7) — first aid vs. medical treatment, work-relatedness, and the general recording criteria — and it stays the employer's own determination, case by case. This tool starts from the counts already on your OSHA 300 log and does the rate arithmetic; it does not review, or reach a conclusion about, any individual case.

Why does a GC prequalification form or insurance renewal ask for this?

Many general contractors set a TRIR ceiling (often 3.0, or their trade's own published industry average) below which a subcontractor cannot bid, and workers' comp carriers use the same rate as one input to a renewal premium. A company that only calculates its rate once a year, when the OSHA 300A summary is due, is often seeing the number for the first time on the same form that is about to gate a bid or a renewal.

How is the injury-free hours figure calculated?

It holds your current recordable case count fixed and solves for how many more hours worked, with no new recordable case, would dilute the rate down to your target: recordable cases times 200,000, divided by the target rate, minus the hours already worked. It is not a prediction and it does not assume anything about future incidents — it is the arithmetic answer to 'if nothing else happens, how much more injury-free work does it take to reach that number.'

Is my data uploaded anywhere?

No account and no network requests — the calculator runs entirely in your browser. Nothing about your case counts, hours worked, or company is sent anywhere or stored anywhere but this device. The optional usage counter records only which features were used and the day, never any of your numbers.

Is this a substitute for OSHA recordkeeping or a Certified Safety Professional?

No. It is arithmetic on the counts you type in. It has no opinion on whether a specific case is recordable, does not review your OSHA 300 log for completeness, and is not a substitute for your own recordkeeping process, a Certified Safety Professional, or OSHA's own guidance. Verify every figure against your own log and a qualified professional before using it on a bid form or insurance submission.