Quick Answer: A cortado and a cappuccino both start with espresso and steamed milk, but the ratio and foam are opposites. A cortado is a 1:1 espresso-to-steamed-milk pour with almost no foam, served in a 4 to 4.5 oz Gibraltar glass. A cappuccino is a traditional 1:1:1 split — espresso, steamed milk, and a dense 15 to 20 mm foam cap — in a larger 150 to 180 ml cup, per Specialty Coffee Association guidelines. The twist: most specialty cafes pour a cortado as a double shot by default (~126 mg caffeine) while a traditional cappuccino stays a single shot (~63 mg), per USDA FoodData Central — so the smaller drink usually has more caffeine, not less.

Cortado and cappuccino both get filed under “small milky espresso drink,” but they solve different problems: one mutes the shot’s acidity with a splash of milk, the other builds a foam-forward drink around it. If you’re weighing cappuccino against its bigger milk-drink relatives, see cappuccino vs latte for the ratio math, or espresso vs cappuccino if you’re deciding whether to add milk at all.

Cortado vs cappuccino, by the numbers

Ratio: 1:1 versus 1:1:1

The core difference is simple math. A cortado is built on a 1:1 pour — typically a double shot of espresso met with an equal volume of steamed milk, landing the whole drink around 4 to 4.5 oz in a Gibraltar glass. A cappuccino adds a third component: roughly equal parts espresso, steamed milk, and milk foam, per the Specialty Coffee Association’s traditional 150 to 180 ml serving. Both start from the same shot; the cortado stops at “espresso plus milk,” while the cappuccino adds the foam layer as its defining third ingredient.

Winner: cortado, for the smallest possible milk addition; cappuccino, if foam is part of what you’re ordering.

Foam: knocked flat versus whipped dense

A cortado’s milk is steamed to a smooth, silky texture with the surface froth largely knocked out before pouring — the goal is to “cut” the espresso’s acidity, not to add texture. A cappuccino goes the opposite direction: the milk is steamed and whipped into a dense, dry microfoam cap that holds its shape, landing at 15 to 20 mm thick in a well-made drink, well above the SCA’s 1 cm minimum spec. If a “cappuccino” on a menu has little to no visible foam cap, it’s closer to a cortado in practice, regardless of the name.

Winner: cappuccino, for anyone who wants the foam texture; cortado, for anyone who wants milk without a foam layer.

Caffeine: the double-shot trick

This is where the two drinks flip expectations. Per USDA FoodData Central, a single espresso shot carries about 63 mg of caffeine regardless of what it’s served in. A traditional single-shot cappuccino sticks to that number. But most specialty coffee shops pour a cortado as a double shot by default, since the drink is small enough that a single shot would feel underwhelming against 4 to 4.5 oz of milk — pushing a typical café cortado to roughly 126 mg of caffeine, double the traditional cappuccino. The smaller cup doesn’t mean less coffee; it usually means more, concentrated into less milk.

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A cortado’s smaller milk pour also means less room to hide a stale bean’s flat, cardboard-y taste — Amazon Fresh can get a new bag of whole-bean coffee to your door same-day if your current stash has been sitting open too long.

Winner: cortado, for caffeine per ounce, thanks to café double-shot convention rather than any inherent difference in the drinks.

Size and glass: the Gibraltar story

A cortado is traditionally served in a small glass — 4 to 4.5 oz, with the 4.5 oz “Gibraltar” glass becoming the unofficial US standard after Blue Bottle Coffee’s founder repurposed cupping glasses from Libbey Glass Company for the drink in the early 2000s. A cappuccino runs noticeably bigger at 150 to 180 ml (5 to 6 oz) per SCA spec, and many US cafes stretch that further toward 8 to 12 oz. If a drink arrives in a small clear glass with visible espresso-and-milk layers and little foam, it’s a cortado (or “Gibraltar”); if it arrives in a wider cup topped with a thick foam dome, it’s a cappuccino.

Winner: cortado, for the most compact, concentrated pour.

Which one should you order or make?

The bottom line

A cortado and a cappuccino aren’t points on the same strength scale — they’re built on different ratios entirely. A cortado’s 1:1 espresso-to-milk pour in a 4 to 4.5 oz Gibraltar glass skips foam almost entirely; a cappuccino’s 1:1:1 split adds a dense 15 to 20 mm foam cap in a larger 150 to 180 ml cup, per Specialty Coffee Association guidelines. The real surprise is caffeine: because specialty cafes typically pour a cortado as a double shot by default, the smaller drink often lands around 126 mg versus a traditional cappuccino’s 63 mg, per USDA FoodData Central — proof that cup size says nothing about shot count. For the machine that pulls a clean shot either way, start with our best espresso machine guide, or see cappuccino vs latte for how the ratio shifts again once milk takes over.