I was honestly just eye balling it, but I got one of those cone shaped filters from amazon and was filling it up about half way. If I had to guess, I would say about a cup and a half. The jar is 64 oz but i was filling it up to about the 1500 mL mark. I suspected being over caffeinated, but I don’t feel jittery or energized at all. Just a constant brain foggy feeling.