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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
Step 3. Multiply the number of part-time hours per week by the number of work weeks in a year to calculate annual hours worked. For year-round work, multiply 10 part-time hours by 52 weeks per year to calculate 520 annual part-time hours.