<p>Unless it’s changed recently, I’ve found the College Board Calculator to be very good.
And, for the FAFSA, even better might be the new 2011-2012 EFC Formula Guide, by the FAFSA people themselves:
[IFAP</a> - EFC Formula Guide](<a href=“http://ifap.ed.gov/efcformulaguide/101310EFCFormulaGuide1112.html]IFAP”>http://ifap.ed.gov/efcformulaguide/101310EFCFormulaGuide1112.html)</p>