Does Ohio Have an Alimony Calculator? The Ohio Child Support Calculator will provide an estimate of the support obligations that may be included in a court or administrative child support order.No formula under Ohio law specifies how spousal support is calculated. (However, some courts offer guidelines that will at least get you in a ballpark.) If you are preparing for a divorce, here is a brief overview of the laws that apply to calculating child support and spousal support in Ohio. Welcome to the Child Support Guideline Manual for Ohio. In Ohio, there is no formula for calculating spousal support as there is with child support. Just as you completed the husband and wife's Payroll forms. There are no statewide guidelines for Ohio Spousal Support as there are for child support. Child support is calculated according to a formula written into state law.