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How much money do I need to have saved up for retirement?
One common rule of thumb: you can probably get 4% or better returns on your investments ('"typical market rate of return is 8%, derate to allow for inflation and off years). Figure out what kind of income you will want in retirement and divide by 0.04 to get the savings you need to accumulate to support that.   This doesn't allow for the fact that your needs are also going to increase with inflation; you can make a guess at that and use an inflated needs estimate.  Not sophisticated,  not precise, but it's a quick and dirty ballpark estimate. And sometimes it's surprisingly close to what a proper model would say.