Free Florida alimony calculator to estimate annual alimony payments and monthly alimony payments. Calculate alimony quickly and accurately with our state-specific alimony calculators.Get an estimate based on your state's guidelines for free. Learn about the types of alimony available in Florida and how judges decide which type to award, how much the payments should be, and how long they'll last. Alimony Reform Enacted in Florida. Florida has just joined the cadre of states that provide a mathematical calculation for alimony. This calculator is intended to be used only as a general tool to estimate potential splits and payments. To calculate Illinois guideline maintenance, you must enter gross income, child dependent, and marriage length information into the calculator. Get an estimate for alimony payments and duration. Get an idea on how much money a month you can expect to pay, and for how you can expect to pay it.