How to calculate man hour in safety.
Man hours are the total number of hours an employee puts into work over a specific period. For example, if you have 2 workers working an 8-hour job in a day, the man-hours for that day are 16-man hours.
Formular for calculating manhour.
The formula for calculating the manhour is
The total number of workers x the Total number of hours worked in a day x the Total number of days worked over a specific period.
How to calculate man hours per day
The recommended working hour per day for a worker is 8 hours. Any additional hours a worker puts in the work is over time. Overtime is added to the 8 hours when calculating the total man-hour in a day.
For example, Worker A worked 8 hours a day, and Worker B worked 10 hours. Therefore, The total man-hours on that day are 18 hours.
How to calculate man hours per week
For example, 20 workers worked 5 days a week for 8 hours daily. The total man hours for that week will be 20 times 8 times 5, which equals 800 man hours.
How to calculate man-hours per month
For example, a team of 20 workers worked for 20 days a month for 8 hours daily. The total man hour for that month will be 20 times 8 times 20 giving you 3200 man hours for that month.
How to calculate man hours per project
When you have a project of 6 months without Saturdays and Sundays-30 days in a month, so for the 6 months, you will have 180 days. You’ll have to subtract the weekend days (Saturdays and Sundays) since there is no work on 8 weekend days per month, and then you have 48 days for that period of 6 months. So, to get the working days in the 6 months, 180 – 48 equals 132 days. So, for 6 months, your team will work for 132 days.
In calculating the man hours for 20 workers for 132 days on 8 hours a day work,
20 X 8 X 132 = 21120-man hours
So with this value, you can make your financial projections for the project.
What is the benefit of man hours?
The manhour is significant in determining the financial progress, production pieces and the safety performance of the work.
Financial progress and viability of a project
For example, if you have a project that will bring in $200,000. The 20 workers will work for 2 weeks on the project until completion, and each will use 40 hours weekly for the work. The manhour for the two-week job will be 20 times 40 times 2 equals 1600 man hours.
That means a worker gets 125 dollars per hour (200000/1600) of work. And you have already budgeted to pay 25 dollars per hour. The project is viable.
But if the project brings in $20000, each worker brings in $12.5. The project is not viable as this cost may not be able to offset the expenses for you.
So, considering these two scenarios will guide you when making future decisions. One of the decisions you can make is how to cut costs by hiring professionals to do that for you when making financial decisions. It can even be that you underbid the contract. As you bid on projects, you can use past calculations to inform your estimations for new ventures.
Use in calculating the production pieces.
Productivity is a function of output generated with considerable input over a given period. The production pieces are calculated using man-hours. You can calculate your firm’s productivity by determining the number of production pieces you make per man-hour. See the example below on the calculation of production pieces.
For example, a company produced 50,000 units of concrete blocks in a month. In that particular month, 15 workers worked 8 hours daily for 20 days. The production piece is as below.
Man hours for that one month= 15 x 8 x 20 = 2400
Therefore, The production piece = 50000 divided by 2400.
Production piece = 20.4 concrete blocks per man hour.
You can know the number of concrete blocks produced in a given man-hours. This value will help the company to make certain decisions in its production.
Health and Safety performance
If company A records 5 LTI over every 10,000 man hours over 30 days and company B records 10 LTI over every 100,000 man hours over 30 days. Company B has a better safety performance than company A when judging by manhours and the LTI records.
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Onyeka Emma is a QHSE Professional with more than 10 years of experience in occupational health and safety, which spans many industries such as construction, beverage, oil and gas, etc. He has many health and safety certifications, including NEBOSH IGC, ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 Lead auditor certificate. A member of IOSH, ISPON, and Nigeria Red Cross Society. He is interested in business, entrepreneurship, Speaking, and motivating people to do better for themselves. He enjoys leisure with a good motivational book.
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