How many cups of coffee is it safe to consume per day? This question is in two parts:


How many cups of coffee can one safely consume each day before first experiencing side-effects? and
How many cups can one consume before it's considered harmful to one's health?


This is assuming a generally healthy human being of average weight and average height who is not taking any medication.
I would recommend scanning the DSM-5 (Diagnostic and Statistical Manual, 5th edition) on caffeine and coffee addiction, as well as looking at independent studies.

Because caffeine is the most widely consumed psychoactive substance there have been many studies done on the benefits and side affects, both of which can be highly dependent on what type of person you are specifically.

Generally speaking, caffeine is considered safe for healthy adults, and you should guage your consumption based on what you think fits your lifestyle