Child support and alimony estimates, state by state.
Free calculators built on each state's official guideline, updated for 2026, with every formula and source shown.
Start with your state
- CaliforniaGuideline formula: CS = K[HN - (H%)(TN)]
- FloridaSchedule range: $800 to $10,000
- IllinoisSchedule revision: March 20, 2026
- NevadaOne child: 16% / 8% / 4%
- New YorkCombined income cap: $193,000
- PennsylvaniaSchedule range: $1,300 to $30,000
- TexasNet resources cap: $11,700 / month
- VirginiaSchedule range: $0 to $42,500
- WashingtonTable range: $2,200 to $50,000
- WisconsinOne child: 17%
More states are added as each formula is verified and tested.
How the estimates work
Every calculator is a direct implementation of a statute, not a rule of thumb. You can follow each step of the math in the result panel and open the source it comes from.
Read the methodology- 1
Start from the statute
Percentages, caps, schedules and add-on rules come from the state code and the agency tables it references.
- 2
Show every step
Net income, guideline percentage, caps and adjustments are listed line by line so nothing is a black box.
- 3
Test and date it
Each formula is checked against worked examples, and every page shows when its figures were last reviewed.
Child support calculators by state
Ten states are live today. Each page covers the guideline formula, the current caps, a worked example and the statute it comes from.
- AlabamaSoon
- AlaskaSoon
- ArizonaSoon
- ArkansasSoon
- California
- ColoradoSoon
- ConnecticutSoon
- DelawareSoon
- District of ColumbiaSoon
- Florida
- GeorgiaSoon
- HawaiiSoon
- IdahoSoon
- Illinois
- IndianaSoon
- IowaSoon
- KansasSoon
- KentuckySoon
- LouisianaSoon
- MaineSoon
- MarylandSoon
- MassachusettsSoon
- MichiganSoon
- MinnesotaSoon
- MississippiSoon
- MissouriSoon
- MontanaSoon
- NebraskaSoon
- Nevada
- New HampshireSoon
- New JerseySoon
- New MexicoSoon
- New York
- North CarolinaSoon
- North DakotaSoon
- OhioSoon
- OklahomaSoon
- OregonSoon
- Pennsylvania
- Rhode IslandSoon
- South CarolinaSoon
- South DakotaSoon
- TennesseeSoon
- Texas
- UtahSoon
- VermontSoon
- Virginia
- Washington
- West VirginiaSoon
- Wisconsin
- WyomingSoon
Frequently asked questions
Are these calculators accurate?
Each calculator applies the formula in the state statute, using the current caps and percentages, and is covered by automated tests against worked examples. The result is a guideline estimate. Courts can deviate, and net income depends on your real tax situation.
Which states are covered?
Child support calculators are live for California, Florida, Illinois, Nevada, New York, Pennsylvania, Texas, Virginia, Washington and Wisconsin, and alimony calculators for California, Florida, Illinois, New York, Pennsylvania, Texas and Virginia. Additional states are published as each formula is implemented from its statute and verified.
Is this legal advice?
No. Fairsum is an independent reference. It does not give legal advice or create an attorney-client relationship. For a binding figure, use your state's official worksheet or consult a family law attorney.
How often are the numbers updated?
Caps, percentages and tax figures are reviewed at least once a year and whenever a state publishes a change. Every calculator page shows its last review date and links to the statute it relies on.