Calculating Annual Salary Using Bi-Weekly Gross 14 days in a bi-weekly pay period. 365 days in the year* (*please use 366 for leap years) Formula: Annual Salary = Bi-Weekly Gross / 14 days X 365 days. Example: if your bi-weekly gross is $1,917.81, your Annual Salary = $1,917.81 / 14 days X 365 days = $50,000.