If you really want to figure out your life-altering number, first figure out your life-altering amount of *spendable* passive income, and then multiply by 50 to get your net worth needs.

So, if you want to live off $100,000 for life, you need $5m cash.

You only get to spend 2% of it per year, because on average you might be getting 8% returns (if you're good) per year, and:
- 40+% will be taxed
- 3% you need to put back in just to fight inflation (we're talking USD here...)

Bottom line, if you have 50+ years left to live, limit your spending to 2% of your net worth.