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.How is alimony calculated in North Carolina? Our alimony calculator will provide you with a basic support calculation for the following states or formulas. This calculator will help you get an idea of what you or your spouse may end up paying based on income and the length of the marriage. In North Carolina, child support is calculated based on the North Carolina Child Support Guidelines. Unlike some other states, North Carolina does not have a statewide specific formula or mathematical guidelines that can be used to calculate PSS and alimony. Before you consider how much spousal support you deserve, you have to figure out if a judge is likely to grant or deny it. Unfortunately, there is no alimony calculator or magical equation. Alimony and Post Separation Support divorce lawyers in North Carolina.