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I have used the calcualtor at It is one the best around. There are some good calculators at that will do a number of calculations. They all assume constant inflation and rates of return. You cannot get away from that problem. The only way that I am aware that you can solve this problem is to develop a spreadsheet and use the historical results of some strategy and inflation. Start with your nest egg with a given strategy for withdrawing your money on an annual basis. Like 4% adjusted for inflation each year. I have done this for my retirement to know how much I could withdraw safely. I can help you with this if you are not comfortable with making spreadsheets. There is no guarantee that your money will last since you are using historical returns, but is better than a fixed return or fixed inflation. If you are conservative with your investment returns (6 to 9%) and inflation (4 to 6%) estimates you get a very good idea using the calculators whether your money will last.
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