F.I.R.E.

FIRE - Financial Independence Retire Early

Here's a Rule of Thumb I just learned.  Nothing earth shattering or ground breaking -- the "25x Rule."

Take your annual spendings (food, gas, mortgage, insurance, etc...) and x 25.  That's how much money you need to retire.

If I spend $10k a month. 
That means I spend $120k a year. 
$120k x 25 = $3M.