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. Our free California spousal support calculator helps you easily estimate your potential spousal support payments. Quick, easy, and accurate. This California alimony calculator calculates California maintenance using the California county alimony formulas. The DissoMaster(TM) is a program in the state of California used to accurately calculate child and spousal support payments after a divorce or legal separation. Our tool will calculate how much spousal support a judge may order. Complete the fields to calculate and estimate. If child support is an issue, spousal support is calculated after child support is calculated.