Office of Recovery Services Child Support Calculator. The following worksheets are intended only as a guideline for estimating child support.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. Unlike child support in Utah, there is no formula for judges to use to calculate alimony in a divorce. This free online alimony calculation tool determines if and how much alimony will be paid in your divorce situation. You can calculate your possible child support payment amount two ways: online, using our Child Support Calculator, or on paper, using worksheets. To calculate the amount of support under Utah's current child support guidelines, you can use the official Utah Child Support Calculator. 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.