[Firmwarrior]

It's good to look at the whole picture like that. A lot of "cost of living calculators" tend to implicitly assume you're spending every take-home dollar on eggs or gasoline, which isn't true for highly-paid software engineers.

I'd propose that you should also calculate how many years of 300k in the Bay Area it'd take to retire in Prague vs years making 100k in Prague.

I ran these numbers a couple years ago, and it was costing me about ~$8000/month to live in the Bay Area. I estimated we could live in Tokyo or much of the USA at a similar quality of life for $4000/month. With $310k/year (taking home $190k) that meant I was able to save about $90k a year. In Tokyo, I could only get companies to offer about $140k at the time, and it was about the same for remote work in the USA. That meant I could save about $50k/year.

You can make a strong argument that saving $50k and living in one location is better than saving $90k in another, but it's good to have all the data at hand to make the best decision for yourself.