Child Support Calculator

Estimate a monthly child support amount and identify the guideline model your state uses.

Because child support is set by state law (there is no uniform federal formula), this is an educational estimate only — your state's official calculator is authoritative.

Parents & children

State (drives the guideline model)

Select a state to identify its guideline model.

Number of children (1–12)

Noncustodial parent's gross income (per month)

Custodial parent's gross income (per month)

Noncustodial parent's overnights per year (parenting time)

Presets: 0 = no overnight time · ~92 = 25% · ~128 = 35% · ~183 = 50/50. Most Income-Shares states reduce the obligation as overnights rise.

Additional costs (optional)

Health insurance cost for the child (per month)

Work-related childcare cost (per month)

Existing support obligations (per month)

Subtracted in the Melson model; most other models don't deduct it.

Estimated monthly child support

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State guideline model:

Noncustodial income share

borne by NCP

Parenting-time adjustment

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factor applied

Methodology

Inputs used

Every state has its own official child support guideline calculator. This is an ESTIMATE for educational purposes. Your state's child support agency or a family-law attorney determines the binding amount. Percentages and Income-Shares obligations here are illustrative pre-lawyer figures; always confirm with the official state calculator.

Data sources

Model assignment (Income Shares / Percentage-of-Income / Melson / DC hybrid), the Wisconsin band schedule, and self-support reserves are grounded in the spec's cited sources (NCSL, WI DCF 150, IRP-Wisconsin, SC DSS). Exact dollar amounts are illustrative unless tied to an official figure marked in the methodology.