Office of Recovery Services Child Support Calculator. The following worksheets are intended only as a guideline for estimating child support.However, the following calculator provides an estimate of a potential alimony award in the State of Utah. Alimony, sometimes referred to as spousal support, is the court-ordered money that one party pays to the other party for support while they are separated. To calculate the amount of support under Utah's current child support guidelines, you can use the official Utah Child Support Calculator. Learn how alimony is calculated in Utah, what judges consider when deciding spousal support awards, and how to get alimony payments changed. This free online alimony calculation tool determines if and how much alimony will be paid in your divorce situation. Child support is calculated using the gross monthly income of both parents and the number of overnights the child spends in each household. Quick, accurate results. You can calculate your possible child support payment amount two ways: online, using our Child Support Calculator, or on paper, using worksheets.