I think I calculated it to be 4.4 million, but that is assuming I do not move to a cheaper part of the world. I could probably get by with 2/3 or even half that

I think I calculated it to be 4.4 million, but that is assuming I do not move to a cheaper part of the world. I could probably get by with 2/3 or even half that if I had lower costs of living. I never factored that (or made a list of places to live in such a case) because calculating a projected amount of medical costs quickly becomes very complicated in that scenario. I prefer living in a part of the world that has a mostly fixed lifelong medical cost (even if it is on average a little higher for my projected total costs), just for the security this will afford me. I'd have to invest this 4.4 million at about 4% interest (this is as you can see very conservative and in general seems to be regarded as a very safe interest level) to stay at that level of wealth more or less for the rest of my life. I could then pass it on to my children, which was one of my requirements. If you do not have that, the number can probably be a lot lower. It's possible that investing part of it into a house (with stuff like solar panels and a heat exchanger) might make for a better return month to month (with lower risk, very important). I've not yet made serious calculations to that effect, but the napkin math suggests to me that this is the case. Obviously this would not be enough to cover everything, but it might make the final number lower also. This is complicated further by potential maintenance costs that you need to factor in.