Although you should be able to figure out fairly quickly how many hours you work in a normal week, the calculation for how many hours you work per year is not quite as simple. It is a useful number to know in your personal finances for a few reasons. For example, if you know your annual salary, you can use the number of hours you work per year to calculate your hourly rate. Conversely, if you work at an hourly rate, you can estimate your annual salary by figuring out how many hours you work per year.

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Add up the number of hours you work during a typical week. For many people, this will be eight hours per day times five days of the week, or 40 hours per week. If you work a different schedule, you might have to calculate the length of each shift and add these together. If your schedule changes often, calculate your work hours for the last four weeks and divide it by four to find the average weekly hours.

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Multiply the number of hours in an average week by 52 to get a base number of hours per year. For example, 40 hours per week times 52 weeks gives 2,080 hours per year.

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Add the number of extra hours you work during busy times of the year. For example, if you work in retail, you probably have to work extra during the winter holiday season. For example, if you expect to work an extra six hours per week from Thanksgiving to Christmas, which is usually about four weeks, add 24 hours to your total, bringing it to 2,104.

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Subtract the number of hours you take off for holidays, vacation and sick time each year. Although these hours are on the work calendar, you do not actually work for these hours. For example, you might have 10 holidays at eight hours each, 10 vacation days at eight hours each, and seven sick days at eight hours each. Subtract 216 hours from 2,104 to bring your total down to 1,798.