How much depends on how much you put in and how many credits you have etc.
This figure will differ for everyone so only the Social Security Administration can tell you.
If you don't have the figures, you will still have some idea, based on if you earned a lot and paid social security taxes or if you paid little tax.
You need 40 credits to qualify, and you can earn up to 4 a year.
In 2011, you needed to earn $1,120 per tax credit and by the time you earned $4,480 you would have earned the 4 credits.
Every year, the Social Security Administration sends, "Your Social Security Statement", with the financial figures that explain how much you would get.
In 2011, they decided to save a few bucks and didn't put the statements out.
They might resume for some folks over 60 in 2012
First make sure you take a look at the "Retirement Age" page on this site.
In 2017, Social Security will begin paying more in benefits than is collected in taxes.
By 2041, the social security system will have to have some drastic changes or it will be exhausted, and there will be just enough to pay 78 cents on the dollar for benefits.