The average 8 oz cup of standard-drip coffee contains 95 milligrams of coffee, the average 1-oz shot of espresso contains an average of 64 milligrams and the average French press cup of coffee has an average of 110 milligrams per cup.
For most adults, it is safe to drink up to 400 milligrams of caffeine, which can be very easy to exceed (especially when brewing with a large pot). To make the most of a cup of coffee, it is important to maintain a good sleep schedule and to limit coffee to when cortisol levels are low (between 9 am and 11:30 am or between 1 pm and 5 pm).