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. 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. 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. An alimony calculator can provide a rough estimate of potential alimony obligations in California. Use their child support calculator to help you get an idea of how much child support may be required for your case in NY. We have updated our online calculator below. An auto-calculating version created in Microsoft Excel is also available for download.