Child support calculator

Estimate child support in any US state.

Free, no signup. Uses each state's primary formula (income shares, percentage of obligor, or Melson) with add-ons and shared-parenting credit.

Estimate only — not legal advice

Real orders depend on deductions, imputed income, tax filings, health plan specifics, and judicial discretion. Use this for ballpark planning; consult a family law attorney before relying on a number.

Inputs

State

Number of children

Paying parent net monthly income ($)

Other parent net monthly income ($)

Overnights/year with paying parent

Health insurance for kids ($/mo)

Childcare for work ($/mo)

Estimated monthly support

$998

Base obligation: $1,000
Healthcare + childcare add-on (paying parent's share): $0
Shared-parenting adjustment: −$2

California uses an income-shares model: combined obligation prorated by income share (63%).
Shared-parenting credit applied for 110 overnights (0% reduction). Many states only apply this above a threshold (often 35-40%).
Uses formula CS = K(HN - (H%)(TN)). Estimate only.

Track support payments after the order

Once you have an order, CoParent Circle's Support tracker logs every payment, calculates arrears, and produces a court-ready ledger PDF — free.

Start tracking free

How each state calculates support

Income shares (~41 states)

Combined parental income produces a basic obligation table; each parent owes their proportional share. Used in CA, NJ, FL, OH, IL, and most others.

Percentage of obligor (~6 states)

A flat percent of the paying parent's net income per child. Used in TX, NY, MS, NV, ND, WI, AK.

Melson (3 states)

Reserves a self-support floor for the paying parent before computing obligation. Used in DE, HI, MT.