Child Support Calculator by State
Estimate child support payments using state-specific guidelines. Input income, custody arrangement, and expenses for an instant calculation based on your state formula.
Calculate Estimated Child Support
Select your state and enter the required financial information to generate a child support estimate. The calculator applies your state's specific formula and guidelines. Required inputs include the gross monthly income for both the custodial and non-custodial parent, the number of children requiring support, the parenting time split expressed as overnights per year for each parent, monthly health insurance premiums for the children, monthly childcare costs, and any extraordinary expenses such as special education or medical needs. The calculator outputs the presumptive monthly child support amount, adjustments for shared custody time, credits for healthcare and childcare contributions, and the net monthly obligation. Results are based on each state's published guidelines tables and formulas as of 2026.
Child Support Benchmarks
How to Use This Calculator
Select Your State
Choose your state to apply the correct formula. Each state has unique guidelines, income tables, and adjustment factors. The calculator automatically applies the appropriate model (Income Shares, Percentage of Income, or Melson Formula) for your jurisdiction.
Enter Both Parents' Income
Input the gross monthly income for both parents. Include wages, salary, bonuses, commissions, self-employment income, rental income, and investment income. Some states also impute income if a parent is voluntarily unemployed or underemployed.
Specify Custody and Expenses
Enter the number of children, the parenting time arrangement (number of overnights per year for each parent), monthly health insurance costs for the children, and monthly childcare expenses. Shared custody arrangements typically reduce the support obligation.
Review Your Estimate
The calculator shows the presumptive guideline amount along with adjustments. Remember that courts may deviate from guidelines based on factors like extraordinary medical needs, educational expenses, or a significant disparity in the parents' standard of living.
What This Calculator Helps You Do
- ✓Provide clients with immediate preliminary estimates during initial consultations without manual guideline lookups
- ✓Compare outcomes across different custody arrangements to help clients understand the financial impact of parenting time proposals
- ✓Identify cases where deviation from guidelines may be warranted by comparing calculated amounts to the client's specific circumstances
- ✓Prepare for court hearings with documented calculations that follow the state's prescribed methodology
- ✓Evaluate modification requests by comparing current orders to recalculated amounts based on changed circumstances
Frequently Asked Questions
How is child support calculated differently across states?
There are three primary models. The Income Shares Model (used by 41 states including California, Texas, Florida, and New York) considers both parents' combined income and allocates the child support obligation proportionally. The Percentage of Income Model (used by states like Wisconsin and Mississippi) bases the calculation solely on the non-custodial parent's income as a flat percentage. The Melson Formula (used by Delaware, Hawaii, and Montana) is the most complex, incorporating a self-support reserve for each parent before calculating the obligation. Within each model, states set their own income tables, percentages, and adjustment factors.
Does shared custody reduce child support payments?
In most states, yes. When the non-custodial parent has the children for a significant amount of time (typically more than 25-30% of overnights per year), the child support obligation is reduced. The rationale is that the non-custodial parent incurs direct costs for housing, food, and activities during their parenting time. The exact threshold and reduction formula vary by state. Some states use a straight pro-rata reduction while others apply a more complex cross-credit calculation.
Can a judge order more or less than the guideline amount?
Yes. Guidelines create a presumptive amount, but judges have discretion to deviate based on specific factors. Common reasons for upward deviation include extraordinary medical expenses, private school tuition, or a child's special needs. Common reasons for downward deviation include the obligor's significant debt burden, support of other children, or substantial in-kind contributions. In most states, the judge must make written findings explaining why the guideline amount is unjust or inappropriate before ordering a different amount.
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