If you make $42,000 a year, your hourly salary would be $20.19 assuming you work 40 hours per week. This calculation is based on dividing the annual salary by the number of weeks per year and the number of hours worked per week. If you work fewer or more hours per week, your hourly rate will be different. For example, if you work 35 hours per week, your hourly rate would be $24.00. Similarly, if you work 37.5 hours per week, your hourly rate would be $21.54.