See how parenting time affects the total. Use our free online child custody calculator to determine a custody payment in Washington State in 2024.The following calculator provides an estimate of a potential alimony award in the State of Washington. Learn how judges make decisions on alimony in Washington—whether to award maintenance, how much, and for how long—and whether you can change an award later. You can get a rough estimate of your monthly child support obligation with Washington's Quick Child Support Estimator. The court figures out each parent's income based on the information in your worksheets. It adds together the parents' incomes. This article and video explain spousal maintenance (alimony) in Washington State. They also explain undifferentiated family support. The Child Support and Credit Worksheets are an Excel document that uses automated calculations to simplify completing them.