Divide the annual salary by 26 for one paycheck. Divide the same salary by 12 for one month. A $52,000 salary is $2,000 every two weeks and about $4,333.33 a month. Two of those paychecks are $4,000, which is $333.33 short of the month.
Most months contain two paychecks. Two months in a year contain three, because 26 paychecks do not split evenly into 12 months. This page uses gross pay. Withholding is a separate percent you enter on the paycheck page.