Worksheets to calculate guideline amounts of maintenance and child support. Optional tools to help with calculations are below.How to Calculate Spousal Support on Long Island, NY. Calculating alimony is based on factors directly relating to the marriage and not just a numeric formula. New York family law has a formula for calculating temporary support based on the income of both spouses and the amount of child support to be paid. We serve clients in the Counties of Westchester, Putnam, Dutchess, Nassau, Rockland, and New York. Your divorce lawyer in New York will explain the two main methods for calculating alimony. New York Alimony or Maintenance Calculator that calculates alimony or maintenance payable based on a state formula. Spousal support is the financial support that exists between spouses for the time they are legally married. Free Consultation - Call 800.696. Spousal support awarded in actions for divorce or separation is also known as "maintenance" in the state of New York.