How many times have you needed money immediately in your life, and how much money have you needed for those incidents? Personally, I do not recall ever spending more than a hundred dollars without at least a day's warning. Then again, I don't own a car, which is a big cause for emergency spending - but really that ought to have it's own fund treated as self-insurance.
How many times have you needed money immediately in your life, and how much money have you needed for those incidents?
Well, if you want to approach this properly... :-)
...then you'll need to evaluate the probability density of situations in your life where not having a certain amount of cash on hand will lead to severely negative outcomes (aka high costs). I expect that you'll have much difficulty in trying to form a reasonable estimate (see Nassim Taleb and the general Black Swan concept). Notably, limited amount of historical data (as in, e.g. your pe...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.