There isn't a specific formula for calculating alimony in North Carolina, and the calculator above should be considered a rough estimate. North Carolina doesn't provide a formula for calculating postseparation support or alimony.Settlyd's Alimony Calculator will allow you to target a desired income, and Settlyd will provide the appropriate Child Support and Alimony to reach that target. How Does the Family Court Calculate Alimony in South Carolina? The calculator below can provide you with an estimate as to how a court may handle alimony. We provide this calculator so that you can obtain an estimate of how much child support may be ordered in your case. The following calculator provides an estimate of a potential alimony award in the State of North Carolina. Calculating A Range of Alimony Page. 12. Get an estimate for alimony payments and duration. Get an idea on how much money a month you can expect to pay, and for how you can expect to pay it.