A standard Dunkin iced coffee lands in the 198–396 mg range, with the jump coming mostly from cup size.

A decaf espresso shot usually lands around 3–16 mg caffeine, with the final hit set by the beans and the shot recipe.

A medium hot coffee at Dunkin often sits near 210 mg of caffeine, with size and drink style pushing it lower or higher.

A 12-fl-oz can of Diet Coke contains 46 mg of caffeine, with smaller cans close to 29 mg and larger bottles scaling up by ounces.

A Dunkin’ medium iced coffee typically contains about 297 mg of caffeine in a 24-oz cup.

A Starbucks decaf latte usually lands in the low single digits of caffeine per cup, with most of it coming from the decaf espresso shot.

A 12-oz can of Dr Pepper contains 41 mg of caffeine, listed on the brand’s product facts label.

A standard double espresso often lands near 125 mg of caffeine, though real cups can run from about 95 to 185 mg.

Most healthy adults stay within 400 mg a day when caffeine is spaced out, while pregnancy and youth call for lower daily caps.

A decaf espresso shot still carries 2–15 mg of caffeine, with the number shifting by bean, decaf process, dose, and the way the shot is pulled.