Man hours is the total hour worked over a specific period of time. As a health and safety personnel you need to understand how to calculate man-hour since it is necessary for determining the health and Safety performance.
Man-hours are a crucial element in submitting a winning project bid as well as charging for work completed. Because labor constitutes such a large portion of any contract work, estimating and reporting hours accurately is crucial to having a successful business.
How To Calculate Man Hours
How to calculate man hours formula =
Total hours work a day x Total number of workers x Total numbers of days worked over the specific period of time
- Number of hours worked a day: 8 hours
- Total number of workers: 20 workers
- Specific period of time: 3 months – 90 days (January – March), minus weekends and public holidays.
Assuming that weekend and public holidays = 24 days
We subtract 24 from the number of days within the 3 months
90 – 24 = 66 days
Man-hour = 8 x 20 x 66
= 10,560 hours.
From the example above, man-hour is calculated from simple parameter.
You can substitute the values with your organization’s specific value to determine the man-hour for a specific period for your organization.
Note that: Man-hour is an integral factor in measuring Health and safety performance.
An organization that records 5 LTI in every 10,000 man-hour every 3 months and the organization that record 10 LTI in every 100,000 man-hour every 3 month poses different Health and safety performance level. Judging by the man-hour and the LTI recorded, the second organization has a better Health and Safety performance.
Man-hours exclude the breaks that people generally require from work, e.g. for rest, eating, and other bodily functions. They count only pure labor. Managers count the man-hours and add break time to estimate the amount of time a task will actually take to complete. Thus, while one college course’s written paper might require twenty man-hours to carry out, it almost certainly will not get done in twenty consecutive hours. Its progress will be interrupted by work for other courses, meals, sleep, and other human necessities.
Significance of Manhour
One significance of manhour is that by dividing the total number of man-hours by the total number of workers available, the man-hour concept has the advantage of allowing one to calculate the impact of staff changes on the total amount of time needed for a task. A team of two workers will finish a task that requires twenty man-hours in ten hours, whereas a team of five workers will finish it in four hours.