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Lots of moving parts that must be taken into account and no two households are the same. - BruceCM

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That is why I use Excel for my planning. I can make it as detailed and as specific to my circumstances as I want to. I have added and fined tuned my model over the years not only update with current asset values as the starting point but to update assumptions about future inflation factors, investment returns, allowances for contingencies, spending and timing of optional items, and so forth.

My spreadsheet currently has 113 rows in it to calculate and summarize all the various elements of costs, income, investment returns, as well as movement of funds between investment accounts.

It has thirty-one yearly columns, one for current year starting values and then projections for each of the next thirty years. When I still have a high investment balance in year 30, when I will 100 years old, then I feel pretty comfortable. I would never trust an online retirement calculator to capture all the nuances that I feel are important for me to have confidence in the result.
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