Worksheets to calculate guideline amounts of maintenance and child support. Optional tools to help with calculations are below.Couples and the courts can use NYS spousal maintenance calculators to decide on the amount to be paid. Basic Calculation: DETERMINE WHICH FORMULA APPLIES BY CHECKING THE BOXES BELOW: QUESTION A: Will child support be paid for childrenof the marriage? Use the Federal Child Support Tables for your province or territory to calculate child support. Use this free calculator to calculate spousal support according to the Canadian Spousal Support Advisory Guidelines, as well as child support (if applicable). You should keep in mind that this free online calculator only considers employment income and can only do simple calculations. 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. To determine how much spousal support is required, calculate your gross income. This is the amount of money you make after taxes and other deductions.