Calculating Debt Payoff. If you have unpaid child support debt, you can figure out how long it will take to pay it off with our Arrears Payoff Calculator.The Payment Estimator applies the statewide uniform guideline calculation to the information that you enter into the blank fields. Maintenance, or spousal support, is crucial when major life changes occur within family dynamics. Use our California maintenance calculator. See how parenting time affects the total. We provide a calculation printout that can be used to help formulate sums for child support, temporary spousal support while the divorce case is active. This California alimony calculator calculates California maintenance using the California county alimony formulas. To estimate the amount of child support that may be ordered in your case, you can use the state's official Child Support Guideline Calculator. The temporary spousal support amount is based on the lower earner's need and the higher earner's ability to pay.