Caffeine Content in Drinks: Chart by Serving Size

Caffeine does not only come from coffee, and adding up a day accurately is the only way to know whether you are near your limit. The complication is serving size: most charts compare an 8-ounce mug with a 16-ounce can and call it a comparison.

The FDA chart, all at one serving size

The FDA publishes typical caffeine content standardized to 12 fluid ounces, which is the only way the numbers can be read side by side:

Drink	Caffeine per 12 fl oz
Regular brewed coffee, non-specialty	113 to 247 mg
Energy drink	41 to 246 mg
Black tea	71 mg
Green tea	37 mg
Caffeinated soft drink	23 to 83 mg

Two things stand out. Coffee has the widest spread of any everyday drink, so “a cup of coffee” is almost meaningless as a unit. And an energy drink can match a strong coffee at the same volume — then exceed it, because energy drinks are rarely sold in 12-ounce servings. At 16 fl oz the FDA range runs from 54 all the way to 328 mg.

The same drinks at their real serving sizes

Nobody drinks a 12-ounce espresso. These are USDA FoodData Central and FDA figures converted to the serving each drink actually comes in:

Drink	Typical serving	Caffeine
Brewed coffee	8 fl oz (240 mL)	about 95 mg
Espresso	1 fl oz (30 mL)	about 64 mg
Black tea	8 fl oz (240 mL)	about 47 mg
Decaf coffee	8 fl oz (240 mL)	2 to 15 mg
Large coffee-shop drink	16 to 20 fl oz	up to 490 mg
Energy drink	16 fl oz	54 to 328 mg
Dark chocolate bar	3.5 oz (100 g)	50 to 150 mg

Espresso is the clearest illustration of the serving-size trap. A single shot carries less caffeine than a mug of drip coffee, yet it is more than five times as concentrated per millilitre. Both statements are true, and which one is relevant depends on how many shots go into your drink.

The last row on the FDA’s list is the one that ends most arguments: a single super-sized coffee shop drink can carry up to 490 mg — already past the whole safe daily intake for an adult.

Named products, because ranges only go so far

The American Academy of Pediatrics publishes brand-level figures, which are useful precisely because a range of “41 to 246 mg” tells you nothing about the can in your hand:

Product	Size	Caffeine
Reign Total Energy	16 oz	300 mg
Bang Energy Sour Heads	16 oz	300 mg
Celsius Sparkling	12 oz	200 mg
Rockstar Original	16 oz	160 mg
Monster Green OG	16 oz	160 mg
Red Bull Original	8.4 oz	80 mg
Mountain Dew	12 oz	54 mg
Diet Coke	12 oz	46 mg
Pepsi Zero Sugar	12 oz	38 mg
Dunkin’ Iced Coffee	bottled	197 mg
Starbucks Frappuccino	13.7 oz bottle	110 mg

Caffeine pouches, which dissolve between lip and gum, hold as much as 200 mg and deliver it within minutes — the reason they appear in pediatric guidance rather than in beverage charts.

Why the ranges are so wide

Bean or leaf variety, roast level, grind, brew time and the ratio of coffee to water all shift the result, and no two brews are identical. US law requires caffeine on the ingredient list only when it is added as a stand-alone ingredient, so a chocolate-containing product can carry caffeine with no mention of it. Restaurants are not required to disclose amounts at all — the FDA’s own advice is to ask.

Using the chart without a spreadsheet

Add up your day and compare it to the ceiling for your category. A home coffee in the morning (95 mg), an espresso after lunch (64 mg) and a can of cola in the afternoon (35 mg) reach about 194 mg — comfortably within an adult’s 400 mg, and essentially the entire allowance for someone following the caffeine limit during pregnancy. For anyone under 18, see the guidance on caffeine for teens, where the recommendation is not a number.

This content is informational and does not replace medical advice.