Set a cortado next to a flat white and the family resemblance is obvious. Both start with a double shot, and neither wears the tall hat of foam you get on a cappuccino. The difference is mostly volume, with texture a close second.
How Much Milk
A cortado runs about 4 to 4.5 ounces in total, roughly 120 to 130 ml: a double shot and about as much milk again. A flat white is usually 160 to 180 ml (5.5 to 6 ounces), still built on a double shot, so all the extra room goes to milk. In practice that’s close to twice the milk of a cortado.
| Cortado | Flat white | |
|---|---|---|
| Total volume | About 120 to 130 ml (4 to 4.5 oz) | About 160 to 180 ml (5.5 to 6 oz) |
| Espresso | Double shot | Double shot |
| Milk to coffee | About 1 to 1 | About 2 to 1 |
| Milk texture | Warm, barely foamed | Glossy microfoam |
| Origin | Spain | Australia or New Zealand |
That changes the taste more than the numbers suggest. At one to one, the espresso is still the loudest thing in the glass. You taste the roast, and whatever acidity the beans bring. At two parts milk to one of coffee, the milk’s sweetness starts rounding everything off. A flat white is still a strong milk coffee. It’s a gentler one.
How the Milk Is Steamed
For a flat white, the barista stretches the milk into microfoam, a glossy texture with bubbles too small to see, and pours it so the surface stays thin and level, often with a small pattern on top. The name is usually explained by that surface: a white coffee that’s flat, with no froth piled up. For a cortado the milk is mostly heated and barely aerated. There’s less of it and it’s a little cooler, so it sits in the glass more like warm milk than foam.
Where Each One Comes From
The cortado is Spanish and old enough that nobody claims to have invented it. The flat white is younger and fought over. In Sydney, Alan Preston says he put “flat white” on the menu of his Moors Espresso Bar in 1985. In New Zealand, Fraser McInnes says he named one in Wellington in 1989, after a cappuccino’s milk wouldn’t foam and he handed it over as a flat white instead. The two countries have argued about it ever since, and both drink a lot of them.
Which to Order
Order a cortado when you want to taste the espresso and be done in a few sips. Order a flat white when you want something to sit with for ten minutes, still coffee-forward, but softer. If a café makes both with the same beans, try them back to back once. It’s the fastest way to learn what milk does to a coffee.