Alimony Duration Calculator

Estimating how long spousal support might last starts with three inputs: the length of the marriage, the gap in income between the spouses, and the current 2026 state-specific guidelines. Having a rough timeframe in hand matters during divorce, since both parties need to anticipate future obligations and resources before they sit down to negotiate. Treat the number here as a starting point for those conversations, not a verdict.

Many states follow a 'length of marriage' rule, which commonly caps support at 50% of the marriage length for unions shorter than 20 years. Once a marriage passes the 20-year mark, jurisdictions such as California and Florida frequently shift toward indefinite or long-term support that runs until a triggering event, like the recipient remarrying or the payor retiring. The income gap then shapes how much of that maximum window actually gets awarded, along with whether support is ordered at all.

Whatever figure you see, a judge has the final say, weighing need, ability to pay, and the lifestyle the couple built during the marriage. One frequent misunderstanding is treating the 50% benchmark as automatic, which ignores heavier factors like each spouse's earning capacity and health. Because so much turns on those specifics, this tool is educational only and no substitute for a family law attorney licensed in your state.