Alimony & Spousal Support Calculators by State

What changes at the state line

Four things, and they change everything. First, whether a formula exists at all: a minority of states write a spousal-support formula into statute or official guidelines; most leave both the amount and the duration to the judge, guided by a list of factors such as the length of the marriage, each spouse's earning capacity and the standard of living during the marriage. Second, the income base — some formulas use gross income, others net. Third, caps: several formula states limit support to a share of the combined income or to a fixed monthly ceiling. Fourth, duration, which in formula states usually follows a schedule tied to how long the marriage lasted.

Because of this, two couples with identical incomes can face very different outcomes depending on where the case is filed — and the difference is written in the statute, not in a lawyer's opinion. The comparison table shows which states have a formula and what it says.

How to use these calculators

Pick the state where the case is (or will be) filed, enter both incomes and the length of the marriage, and read three things: the estimate, the statute the page cites, and the date it was last reviewed. In states without a statutory formula the calculator shows a widely used rule of thumb — the AAML guideline — clearly labelled as a negotiation starting point, not the law. Treat every result as the range a court is likely to consider, not a prediction of what a particular judge will order.

Guides

• How U.S. States Calculate Alimony: Formula Families (2026)
• Types of Alimony by State: Formula vs. Discretion (2026)