Office of Recovery Services Child Support Calculator. The following worksheets are intended only as a guideline for estimating child support.You can calculate your possible child support payment amount two ways: online, using our Child Support Calculator, or on paper, using worksheets. Child support is calculated using the gross monthly income of both parents and the number of overnights the child spends in each household. See how parenting time affects the total. The following calculator provides an estimate of a potential alimony award in the State of Utah. The following Utah child support obligation calculators can give you some guidance on "how much I have to pay for child support". Alimony calculations will vary from state to state and from judge to judge. There are numerous factors involved in the Utah alimony calculator. This page includes information and forms for modifying child support in an existing divorce, custody or parentage order.