This California alimony calculator calculates California maintenance using the California county alimony formulas. Calculate alimony quickly and accurately with our state-specific alimony calculators.Get an estimate based on your state's guidelines for free. Illinois has established a specific formula for calculating the amount and duration of spousal maintenance obligations or awards. California doesn't use a "calculator" for determining the amount of long-term spousal support. Find out what judges consider when deciding how much alimony to award during or after divorce—and when courts use formulas to calculate spousal support. Complete the fields below and press calculate to estimate alimony. The figures presented are based on legal California alimony guidelines. 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.