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.ORS can collect child support from parents outside of Utah. We can do this with new cases and with cases that are already in place. I'm not aware of any state that deviates from that. States generally use one of three models to determine the base child support amount due. Explanations of each model and the states that use them follow. Learn how child support is calculated in Utah, how support awards can be modified or terminated, and other legal information about UT child support. The size of your child support payment depends heavily on where you live. In any state, get an idea of how much child support you might pay or have to receive after your divorce.