Worksheets to calculate guideline amounts of maintenance and child support. Optional tools to help with calculations are below.This page will help you calculate the figures a New York judge would consider in determining how much should be paid in maintenance and child support. The amount of child support that either parent may have to pay following a divorce is based on several factors, and one of those factors is alimony. Calculating Debt Payoff. If you have unpaid child support debt, you can figure out how long it will take to pay it off with our Arrears Payoff Calculator. Complete the fields below and press calculate to estimate alimony. The figures presented are based on legal California alimony guidelines. The formula uses the parties' incomes and salary, as well as whether or not child support is being paid to perform a calculation. Alimony Calculation Considerations.