Krak,
There is actually a site that contains several calculators to ESTIMATE your EFC or Expected Family Contribution:
http://www.finaid.org/calculators/(Scroll down to Needs Analysis.)
These calculators will give you a rough estimate of your potential EFC. But it really doesn't count until it is officially calculated on your FAFSA. Later when you send the FAFSA to colleges, most of them will try to offer you a financial aid package (grants, loans, etc.) equal to the difference between the EFC (your out of pocket contribution expected) and their total cost per year. But even this will vary by school.
Here is an example:
If your EFC turns out to be $12,000 per year, and your child is accepted at a college which costs $22,000 per year, when you apply for financial aid they will probably try to offer you a total package of $10,000 ... but they may offer a little more, or a little less. (Some colleges do not follow this scenario at all, though.)
Hopefully other folks will have more info for you, but you might want to check out the calculators. The figures were "in the ballpark" for us.
Julie