If you are looking for retirement calculators, personally I think Fidelity has one of the better ones out there. You can plug in numbers individually for you and your spouse, different income streams, start / stop those income streams at different times, play with different investment mixes, etc.
Another good one is personalcapital.com. That is more of a consolidator site where you link in your existing bank, brokerage, retirement, etc. accounts, and it uses the live data to do its analysis. It has a couple of different options for specifying income streams, one-time major expenses in retirement (buying a second home, purchasing new cars every so often, etc.).
Using both of these calculators, I feel like I am on a very good track to retire in 7 years, when I am 58. House is already paid off, and we have been maxing out both 401k and Roth IRA contributions every year for both my spouse and I. We didn't buy a larger house than what we needed, and we drove our cars for 10+ years before replacing (and no BMW, Lexus, Audi, etc -- just basic vehicles). Those two things alone have really made a big difference in how much we were able to save -- especially in our earlier years -- which has given us a huge leg up on those who had to "keep up with the Jones'" and didn't get serious about saving until they were in their 40's or later.
The biggest variable in our plan is the 7-year gap between retirement and when we are eligible for Medicare. As we approach age 58, we can see if we need to work a bit longer if it looks like the medical insurance will be much more costly than we thought, but that would certainly not be the end of the world. And when I do my calculations, I always discount SS payments by at least 25%, because I personally think SS benefits will need to be cut in the future in order to keep the system afloat. I will never rely on the government for keeping me out of the poor house.
Kurt