Emergency fund money is just that, for an emergency and easy to grab at a moments notice. I wouldn't put it in stocks or anything else that you would have to wait for it. How much liquid cash you might need depends on what you would consider an emergency. I live in Florida, where hurricanes like to visit. When the power goes out, it could be out for days or weeks and being able to grab cash before the storm hits ensures that I can buy necessary/emergency things when CC/ATM machines don't work. If I had to wait for that money I'd be in trouble.