Latte, cappuccino, flat white: the same two ingredients

Four names, one recipe

A latte, a cappuccino, a flat white and a macchiato are made from espresso and milk. That is the whole ingredient list, and it does not change between them. No syrup, no second coffee, no different bean. If you can pull a double shot and steam a jug of milk, you can make all four this afternoon.

What separates them is three numbers: how much milk goes in, how big the cup is, and how many seconds you let the steam wand pull air into the milk before you start folding it. Everything a café menu implies about these being four distinct crafts comes down to those three dials. Learning them is more useful than learning the names, because it means you can also make the drinks with no name, including the one you actually like.

The numbers, side by side

Each of these starts from the same double shot, 18 g in to 36 g out in 25–30 seconds, except the flat white, which traditionally uses a 20 g dose stopped at 32 g.

Drink	Cup	Milk	Air	How it reads
Macchiato	60–90 ml	a spoon of foam	2 s, a tiny amount	Espresso, softened at the front
Flat white	160 ml	110 ml	2 s	Coffee-forward, dense, no head
Cappuccino	150–180 ml	120 ml	3–4 s	Balanced, a third of it foam
Latte	220–240 ml	200 ml	1 s	Milky, long, gentle

Two things in that table surprise people. The first is that a cappuccino and a flat white sit in almost the same cup and take almost the same volume of milk. The difference is entirely in the air: double the aeration and the same 120 ml climbs into a cup that looks and drinks like a third foam. The second is that the latte, the milkiest drink of the four, takes the least air of all. A latte is not a foamy drink. It is a long drink with a thin lid.

Air is the variable nobody mentions

Milk volume is easy to control, because you can weigh it. Aeration is the one that decides whether your drink is the drink you meant to make, and it happens in a window of two to four seconds near the start of steaming, while the milk is still cold.

The mechanics are the same every time. The tip sits just under the surface and tears air into the milk with a steady sound. Then you drop the jug so the tip goes deeper, the sound stops, and the milk starts to spin. From that point on nothing is being added: the whirlpool is folding the air you already made through the rest of the milk until the surface goes glossy. Stop everything at around 60 °C, before the proteins slacken and the milk picks up a cooked note.

Count that first window and you control the menu. One second and 200 ml gives you a latte. Two seconds and 110 ml gives you a flat white. Three to four seconds and 120 ml gives you a cappuccino. The same jug, the same wand, the same milk.

The cup, and where to start

A cup is not packaging. It sets the ratio before you have touched the machine, and it is the single most common reason a home cappuccino turns out to be a latte. Pour a correctly built cappuccino into a 250 ml cup and the thirds are gone: you now have a double shot, 120 ml of milk and a lot of air above it, which drinks thin and looks half empty.

Going the other way is just as real. A latte in a 240 ml cup is a 1:6 drink, and that is the point at which people start blaming their espresso. If you want a latte that tastes of coffee, either pull a triple, around 27 g in to 54 g out, or shorten the shot to a 1:1.5, say 20 g in stopped at 30 g. Both bring the coffee back without asking the extraction to work harder than it should.

The shape matters too, though less. A narrower tulip cup keeps the milk deeper and the surface smaller, which is why flat whites are usually served in one: the microfoam has less area to spread over and the pattern lands tighter.

Make the cappuccino first. It has the most obvious failure modes, the aeration window is long enough to hear clearly, and the thirds are easy to judge by eye. Once that is reliable, the flat white is the same drink with half the air, and the latte is the flat white with the air cut again and the milk nearly doubled. The macchiato is the outlier and the easiest of the lot, because it is a double espresso with a spoon of foam on it, and the shot has nowhere to hide.