Close to a mug of coffee, in a can
Bottled and canned coffee drinks, the ready-to-drink kind sold cold in convenience stores, average 28 mg of caffeine per 100 g by USDA’s figures. That works out to about 83 mg in a small 9.5 fl oz bottle, 95 mg in a standard 11 fl oz can, and 130 mg in a larger 15 fl oz bottle. The 11 oz figure lands almost exactly on an 8 oz cup of home drip coffee at USDA’s reference strength (95 mg), just in a bigger, pre-sweetened, cold package.
A generic average, not a label
This figure is USDA’s broad average across the category, and it covers a wide range of real products, from light coffee-and-milk drinks to concentrated cold brew cans. Some canned coffees, like Starbucks Doubleshot Energy, carry more caffeine per ounce than this average and are labelled as energy drinks rather than coffee. The only way to know a specific can’s dose is to check its label; this page is a starting point, not a substitute for it.
Serving temperature and format also vary: some bottled coffees are sweetened milk-and-coffee blends served cold, others are black coffee in a can meant to be drunk warm or chilled, and both fall under this same broad USDA category.
Where it fits in a day
At 95 mg, a standard can sits well under the 200 mg single dose EFSA assessed as safe for healthy adults, and four cans, 380 mg, would still stay just under the 400 mg daily figure the FDA cites for healthy adults. In pregnancy, where ACOG uses a 200 mg daily ceiling, two standard cans already use almost the whole allowance.