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OSHA TRIR Calculator: Total Recordable Incident Rate

Total Recordable Incident Rate, or TRIR, is the standard OSHA measure of how many recordable injuries and illnesses occur per 100 full-time workers in a year. Enter your recordable case count and hours worked and this calculator returns the rate, a gap to your target and a chart of how sensitive the rate is to one more case.

Your numbers

OSHA recordable cases

cases

Count of cases on your OSHA 300 log for the period (deaths, days away, restricted or transfer, medical treatment beyond first aid, loss of consciousness, significant diagnosed conditions).

Average number of employees

people

Average headcount across the year, as used on the OSHA 300A summary.

Average hours worked per employee per year

hours

Actual hours worked, not paid hours. Exclude vacation, sick and holiday time. 2,080 is a full-time 40 hour week for 52 weeks.

Overtime or contractor hours not in the average

hours

Extra hours worked by employees or supervised temps that you want included in total exposure.

Your target or benchmark TRIR

Enter your internal goal or the published BLS rate for your NAICS code to compare against.

Your results

TRIR

2.1003

Recordable cases per 100 full-time workers per year.

Rate per 1,000,000 hours

10.5014

The same data on the base some customers and contractors prefer.

Total hours worked

380,900

Total exposure hours used as the denominator.

Difference from target

-0.8997

Negative means you are better (lower) than the target.

Cases allowed at target rate

5.7135

How many recordables would hold you at the target for this many hours.

Calculation aid only. Confirm case recordability under 29 CFR Part 1904 and hours worked with your payroll records before reporting.

Save results:

TRIR as recordable cases increase

Sweeps OSHA recordable cases from 0 to 20, holding your other inputs fixed.

Automate TRIR and DART from your ERP hours

An optional review of how to pull hours worked and case counts into one monthly safety scorecard.

Optional. The tool and every export work without this. No spam.

How to use this calculator

Take the number of cases from your OSHA 300 log for the period, then enter the average headcount and the average actual hours worked per person. If you track overtime or supervised contractor hours separately, add them in the extra hours field. The result updates immediately. Use the target field to compare against an internal goal, a customer prequalification limit or the BLS industry rate for your NAICS code. The chart shows what your TRIR would be at different case counts for the same hours, which is useful when you are forecasting whether one more recordable will push you over a limit.

The formula and where 200,000 comes from

TRIR equals the number of recordable cases multiplied by 200,000, divided by total hours worked by all employees. The 200,000 figure represents 100 full-time employees working 40 hours a week for 50 weeks, so the rate reads as cases per 100 workers. Some contractors and international frameworks use 1,000,000 hours instead, which is why the calculator also shows that base. The numerator comes from the OSHA 300 log, and the denominator should be hours actually worked, not paid hours.

Recordable includes death, days away from work, restricted work or job transfer, medical treatment beyond first aid, loss of consciousness and significant diagnosed injuries or illnesses
Use the same period for cases and hours
Do not count first aid only cases
Include temporary workers you supervise day to day

Worked example and how to read it

A plant with 180 employees averaging 2,080 hours plus 6,500 overtime hours has about 380,900 hours. With 4 recordable cases the TRIR is 4 times 200,000 divided by 380,900, or roughly 2.1. Compared with a target of 3.0 that is better than goal. Small sites swing sharply: at this size one extra case moves the rate by more than 0.5, so look at a rolling 12 month figure and pair TRIR with leading indicators such as near misses and audit findings rather than judging a single quarter.

Common mistakes

The most frequent error is using paid hours or a flat 2,080 per head, which overstates the denominator and flatters the rate. Others include counting a case in the wrong year, forgetting that a restricted work case is recordable, and mixing contractor injuries into your numerator without their hours in the denominator. If you pull hours from an ERP or HR system, confirm that the time codes exclude paid leave. Treat TRIR as a lagging indicator: it tells you what happened, not whether your controls are working today.

Frequently Asked Questions

What is a good TRIR?

It depends on the industry. BLS publishes rates by NAICS code each year, and manufacturing averages are usually in the low-to-mid single digits. Compare to your own NAICS code, and note that many customers prequalify contractors at or below a fixed number such as 1.0 or the industry average.

Is TRIR the same as OSHA incident rate?

In practice yes. OSHA and BLS call it the total recordable cases incidence rate. It uses the 200,000 hour base. Lost time rate and DART rate are separate measures built on subsets of those cases.

Do first aid cases count in TRIR?

No. Only cases that meet the recording criteria in 29 CFR 1904.7 count. Treatments listed as first aid, such as a bandage or non-prescription medication at non-prescription strength, are not recordable.

Which hours should I use?

Use actual hours worked by all employees, including overtime, and exclude paid time off. If you do not have exact hours, OSHA allows an estimate based on payroll, but document how you derived it.

If your hours sit in an ERP or time system and your cases in a log, we can set up a read-only view that calculates TRIR and DART by site and month without exports. Ask us for a short review.

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