how to calculate weekly salary
1 You may calculate biweekly gross by dividing annual salary by the number of days the salary is based on for the year and multiplying the result by 14 days. 2  For example, $52,000/365 days = $142.47 x 14 = $2,000. 3  Gross represents your entire salary before deductions.ivide biweekly gross by the number of days in the pay period to arrive at daily rate. For example, the biweekly gross is $2,000 and you work a standard 40-hour week; the daily rate is $200, the equivalent of $2,000/10 days. Related Reading: How to Calculate Hourly Rates for Bonuses. Step 3.