This Child Support Calculator allows Virginia parents to reasonably estimate their child support payments. See how parenting time affects the total.This Virginia alimony calculator calculates Virginia maintenance using the Fairfax County alimony formula. Our Virginia Child Support Calculator allows Virginia parents to estimate child support payments. The Firm For Men provides this free child support calculator. The formula for deciding the child support amount uses information parents give in this worksheet. Learn how to calculate child support in Virginia, when the support amount may be different than the guidelines, and how to collect and change child support. Use this calculator the get an estimate of alimony for the state of Virginia! If a party is not paying or receiving spousal support, insert "none" in the appropriate column(s). Please note that there is no set formula for spousal support in Virginia.