Multiply the number of hours an employee works per week by the hourly wage. Then multiply that number by 52 (the number of weeks in a year). If you make $20 an hour and work 40 hours per week, your annual salary is $20 x 40 x 52 or $41,600. On the other hand, if your annual salary is $41,600, you can get the hourly rate by dividing it by 2080 hours (40 hours x 52 weeks), which is $20 per hour.