Calculate alimony quickly and accurately with our state-specific alimony calculators. Get an estimate based on your state's guidelines for free.Learn how alimony is calculated in Utah, what judges consider when deciding spousal support awards, and how to get alimony payments changed. This Illinois alimony calculator makes Illinois maintenance calculations using the Illinois alimony formula. To calculate Illinois guideline maintenance, you must enter gross income, child dependent, and marriage length information into the calculator. MaritalLaws Alimony Calculator. Gross Salary: Salary before taxes are taken out. The Utah Alimony Calculator is designed to offer estimations based on various input factors, such as income, length of marriage, and specific circumstances. For more information on estimating your spousal maintenance or alimony amount, feel free to use our Illinois alimony payment estimator. 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.