I understand your frustration with the downloaded SS calculator. (As I said, it's a horrible user interface. In this case, PIA stands for Pain In the A&&.)
FYI, any SS estimate other than the estimate from the downloaded calculator assumes you will work at your most recent income level
until 62 or 67 or 70. (Not useful for those of us who intend to retire "early"!)
When using the downloaded calculator, did you input zero for the years you intend not to be working for money? (For example, for me, I input actual income each past year and zero from this year to ages 62, 67 and 70. I may work in future, but this gives me a conservative estimate.)
Here's the definition of PIA (Primary Insurance Amount):
http://www.ssa.gov/oact/cola/piaformula.htmlAnd the definition of MFB (Maximum Family Benefit):
http://www.ssa.gov/oact/cola/familymax.htmlDid you try cfiresim.com? (In your post, you say "FireCalc".) You'll need your estimated assets at retirement, year of retirement, withdrawal method choice, and estimated Social Security income for you and your spouse (including start year). It's very forgiving and you can play with different withdrawal methods, so don't worry about picking one for your first estimate.