There isn't a specific formula for calculating alimony in North Carolina, and the calculator above should be considered a rough estimate. The following calculator provides an estimate of a potential alimony award in the State of North Carolina.North Carolina doesn't provide a formula for calculating postseparation support or alimony. 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. Our North Carolina Child Support Calculator will automatically calculate your standard child support and allow you to download it in pdf format. Child and Spousal Support Calculations. Our tool will calculate how much spousal support a judge may order. Complete the fields to calculate and estimate. There is no precise formula for determining how much alimony a spouse will be awarded in a divorce case.