Determine how many hours you worked for the period in which you earned that gross pay. If you don't know, the hours should be listed on your pay stub or you can ask your payroll administrator. Divide the gross pay by the number of hours worked, and that will be your hourly rate. For example, if you worked 80 hours in the time period you earned that gross pay, the calculation would be $2,869.24/80 = $35.87 per hour.