There are several different ways to look at this:
1) How much gross income do you want per year in retirement? Less household SS benefit, less pension, less other income = income you need to provide each year from investments. Divide by 3% or 3.5% or 4% to get nest egg needed. 2) JPM estimates for income/age/ wealth. 3) Millionaire next door estimate for wealth (household income x (age x 10%). Add checklist for a plan if you are not on track. How do you save more?