16 oz can of white monster (stereotypical energy drink) has about 150mg of caffeine. A grande (16 oz) black coffee from Starbucks has about 310mg of caffeine. You would need to drink 2 16 oz monsters to get the same amount of caffeine as a single grande cup of coffee from Starbucks.
If you're just looking at caffeine intake you'd be better off switching from coffee to energy drinks. You could drink about 3 per day and be close to the 400mg/day guidance.
edit: white monster has no sugar in case anyone was about to bring that up
If you're just looking at caffeine intake you'd be better off switching from coffee to energy drinks. You could drink about 3 per day and be close to the 400mg/day guidance.
edit: white monster has no sugar in case anyone was about to bring that up