The federal benefit for an individual is $674 for a person in an independent living arrangement. The federal benefit for a married couple is 1 1/2 $674 which is $1011. A married couple or a couple that holds out as married gets less in federal benefits than two singles. Your state may or may not add to the federal benefit.
In California, the state supplement is $171 for an individual and $396 for a couple. More than twice as much, but not as much as it was in 2008 before the huge state payment reductions (3 of them) in California in 2009.