How do you calculate TRIR?

Multiply the number of OSHA recordable cases by 200,000, then divide by total hours worked. With 5 cases and 500,000 hours, TRIR = 5 x 200,000 / 500,000 = 2.0 per 100 workers.

What is the 200,000 in the TRIR formula?

It represents 100 full-time workers each working 2,000 hours per year (100 x 2,000). Multiplying by it normalizes your rate to a standard 100-worker, full-year basis so any size operation can be compared.

Lower is better, and a TRIR under the average for your NAICS industry code is the practical target. Many manufacturers aim below 3.0, and world-class programs run under 1.0; a rate of 2.0 sits in a middle band that warrants comparison to your specific industry benchmark.

What counts as an OSHA recordable case?

Work-related injuries or illnesses beyond first aid — anything requiring medical treatment beyond first aid, days away from work, restricted duty, transfer, loss of consciousness, or a significant diagnosed condition. Only these belong in the cases input.

TRIR vs DART rate — what's the difference?

TRIR counts all recordable cases. DART counts only cases involving Days Away, Restricted duty, or Transfer, so it captures more severe outcomes. DART is always less than or equal to TRIR and is reported alongside it.

How many full-time equivalents does my hours figure represent?

Divide total hours by 2,000. The example 500,000 hours equals 250 FTEs, which is why a 5-case year produces a TRIR of 2.0 — roughly 2 cases per 100 workers.

Safety & Workforce calculator

TRIR Calculator

TRIR (Total Recordable Incident Rate) is the standard OSHA safety metric that normalizes recordable injuries and illnesses to a rate per 100 full-time workers per year. EHS managers, plant leaders, and safety committees use it to benchmark against industry averages, satisfy customer and contractor prequalification requirements, and track whether a safety program is actually reducing harm. Because it scales by hours worked, it lets a 50-person shop and a 5,000-person plant be compared on equal footing. A rising TRIR demands investigation; a falling one is the headline number safety teams report to leadership and regulators.

What this calculator does

Calculate TRIR (total recordable incident rate) for Safety & Workforce from recordable cases and total hours worked, using the OSHA 200,000-hour basis.
Use it to benchmark safety performance for Safety & Workforce against OSHA and industry averages.
It computes the OSHA total recordable incident rate — recordable cases per 100 full-time-equivalent workers per year.

Formula used

TRIR = recordable cases × 200,000 ÷ total hours worked
200,000 = 100 full-time workers × 2,000 hours per year

Inputs explained

Recordable cases (OSHA): Number of recordable cases in the period (usually a calendar year).
Total hours worked: All employee hours worked in the same period (overtime included).

How to use the result

Use it for annual or rolling safety reporting, OSHA and customer prequalification submissions, and benchmarking your rate against NAICS industry averages.
TRIR counts cases equally regardless of severity, so a year with one amputation can show the same rate as a year with five minor stitches — pair it with severity metrics like DART or lost-time rate.

Current U.S. benchmarks

Manufacturing hourly earnings average $30.27 (BLS, Jun 2026), up 4.4% from a year earlier. Median machinist pay is $28.24/hr (OEWS 2025), with state medians on each state page. Manufacturers have 529k open positions nationally (BLS JOLTS).

Common questions

How do you calculate TRIR? Multiply the number of OSHA recordable cases by 200,000, then divide by total hours worked. With 5 cases and 500,000 hours, TRIR = 5 x 200,000 / 500,000 = 2.0 per 100 workers.
What is the 200,000 in the TRIR formula? It represents 100 full-time workers each working 2,000 hours per year (100 x 2,000). Multiplying by it normalizes your rate to a standard 100-worker, full-year basis so any size operation can be compared.
What is a good TRIR? Lower is better, and a TRIR under the average for your NAICS industry code is the practical target. Many manufacturers aim below 3.0, and world-class programs run under 1.0; a rate of 2.0 sits in a middle band that warrants comparison to your specific industry benchmark.
What counts as an OSHA recordable case? Work-related injuries or illnesses beyond first aid — anything requiring medical treatment beyond first aid, days away from work, restricted duty, transfer, loss of consciousness, or a significant diagnosed condition. Only these belong in the cases input.
TRIR vs DART rate — what's the difference? TRIR counts all recordable cases. DART counts only cases involving Days Away, Restricted duty, or Transfer, so it captures more severe outcomes. DART is always less than or equal to TRIR and is reported alongside it.

Last reviewed 2026-05-12.