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Working hours calculator per year Calculation of hours worked over a period of 12 months Consider a worker who work 35 hours per week, 4 vacation weeks and 5 public holidays (for a total of 5 weeks of vacation). 35 hours per week x (52 weeks in one year - 5 weeks of holidays) = 1,645 hours worked per year
1 Example: Say you work an average of an extra two hours every week except when you are on leave, which is two weeks every year. 2  Your extra hours are 2 hours x 50 weeks = 100 hours per year.alculate how many hours you work in one year. For a quick rule of thumb, you can use a standard formula such as: 1  7.5 hours per day x 5 days per week x 52 weeks per year = 1,950 hours worked per year.