How is accident free man hours calculated?
Mia Smith
Published Mar 14, 2026
How is accident free man hours calculated?
Measuring your LTIFR is actually easier than you think. The formula is as follows: ([Number of lost time injuries in the reporting period] x 1,000,000) / (Total hours worked in the reporting period). And voila!
What are safe man hours?
One million safe man-hours is the equivalent of one employee — in the arena of mostly heavy outdoor construction, no less — working 2,080 hours per year (40 hours per week for 52 weeks, with no holidays or vacations included) for more than 480 years without being involved in a lost-time accident.
How is LTI calculated?
To calculate your lost time injury rate, follow this simple formula: Divide your total number of lost time injuries (in a given time period) by the total number of hours worked (in that period).
How do you calculate Ltir from OSHA 300?
Lost Time Injury rate follows a simple formula to indicate your performance. Divide the total number of lost time injuries in a certain time period by the total number of hours worked in that period, then multiply by 200,000 to get the LTIR.
How is accident incident rate calculated UK?
Accident frequency rate formula The formula for calculating your accident frequency rate is the number of reported accidents multiplied by 200,000, divided by the number of employee hours worked.
How do I calculate man-hours?
You can calculate the man hours by multiplying that 40 hours by 20, and then multiply the result by 12. That will equal 9,600 hours, which is how many total man hours your project will take to complete.
How do you calculate man-hours in construction?
You calculate your man-hours for that project by multiplying 20 by 40, and then that sum by 12 (four weeks in a month). That means that it takes your construction staff roughly 9600 hours to complete a project of that size and scale.
What lost time injury?
A lost time injury (LTI) is an injury sustained on the job by an employee that results in the loss of productive work time. An injury is considered an LTI only when the injured worker: Is unable to perform regular job duties. Takes time off for recovery.
What is a good LTI rate?
LTIFR is often considered and referenced as the most useful safety KPI, and is generally considered to be the most reliable proxy for safety performance….Lost time injury frequency rate industry average.
| Industry | LTIFR |
|---|---|
| Manufacturing | 2.67 |
| Mining, Utilities, and Waste Management | 0.80 |
| Other Services | 1.91 |
| Construction | 1.02 |
How do you calculate total man hours worked?
The total man hours per task is obtained by multiplying the number of people assigned to a task by the total time it takes to complete it. Let’s say, for example, that 15 workers at a metal plant and devote 10 workdays to complete an order of 800 product units.
Why does OSHA use 200 000 hours?
The number 200,000 is used because it is the total number of hours 100 employees would work in a year (100 workers x 40 hours x 50 weeks). So, if you had 35 full-time workers, the number of hours they work in a year is 70,000.