I thought I'd like to reveal some "techie" stuff that to me is play. I'm creating a spreadsheet to project our retirement income, wealth and expenses. Right now it's hobbling along, but has provided some insights already.
Of course there are a lot of financial calculators on the web and most of them are free. For example, check out any of the mutual fund or financial news websites. I've also run across http://www.analyzenow.com/ which has a simple calculator for free and a charge for a more expensive one. I've tried only the free one.
About a year ago I got a "retirement plan" from a well known brokerage firm which included a pack of numbers and also a lot of boilerplate. As I looked through it, I was rather struck by it's conclusion that we had some x% chance of running out of money. Oh? What kind of firm would design such a report without realizing that retirement is not a game. That if we're going to plan at all, the first thing we'd want to plan for is to adjust our budget so that we would not run out of money. As I expressed it to the "advisor," her plan was like being shot out of a cannon - wherever the cannon was pointed at the beginning, that's where you were going to go.
My first criteria for a retirement plan is that you do not go bankrupt. I've been saving for over 40 years, is staying above water too much to ask? Closely related to not going bankrupt is being able to describe anticipated income and expenses. For example, at some point I expect we will sell our house. Since the mortgage is paid off, there's an increase in investable assets as well as increased expense from renting. Also I expect to buy an annuity when we reach our eighties, so we'll have an added cost and an increase in income. There are some substantial expenses we have that will end in about a decade, and several other predictable events.
One thing I've learned from the spreadsheet already is that the Required Minimum Distribution (RMD) from my IRA is a bit more than I really need to spend. Because we have to withdraw it, it would then get put into a taxable account (stocks and bonds), which affects taxes. So the spreadsheet has a rudimentary tax calculation for federal and state. That makes sense, since the money is an expense, but I don't feel my life style has improved when my taxes go up.