Flat white vs latte: which has more caffeine?

Does a flat white have more caffeine than a latte?

Yes, at every chain I found that publishes both numbers. It is not close, either. At Starbucks in the UK a Short flat white has 89.1 mg and a Short latte 44.6 mg, so the flat white carries about 2 times the caffeine. In the US the gap at Tall is 1.73 times; in Australia it is 1.67 times, by our division of each chain’s own figures.

The pattern holds at every size in between. In Australia a Tall flat white is 125 mg against 75 mg, and a Grande 190 mg against 150 mg. The full hot Starbucks US ladder, with the cappuccino beside it, is in cappuccino vs latte, so it is not repeated here.

A flat white is what you order when you want less milk and more consequences

None of the top-ranking guides I read prints a single milligram. They argue about the milk instead: one part espresso to two parts milk, or to three, or to four, depending on the page, and none of them cites where its ratio comes from. The menus settle the caffeine question, and the menus are on this page.

Is a ristretto shot stronger than espresso?

In taste, yes. In caffeine, no. A ristretto is a short pull: the same coffee in the basket, less water through it, stopped early. It tastes thicker and more intense because there is less liquid. But caffeine dissolves out as the water runs, and a shot that stops early leaves some behind in the puck.

In a 2023 lab study, Schmieder and colleagues pulled 20 g of ground arabica on one espresso machine under 15 settings of flow rate, grind and temperature, 3 times each (6 at the center setting), and measured the caffeine by HPLC in ten fractions of each shot. Summed to 20 g in the cup (a ristretto), the shot held 130 mg on average; at 40 g (an espresso) 182.6 mg; at 60 g (a lungo) 204 mg. Flow rate and grind moved the caffeine only slightly; how much liquid went into the cup moved it most. 520

Divide the averages and the ristretto kept about 71% of the espresso’s caffeine. That percentage is our arithmetic, not the paper’s. Across the 15 settings it tried, the ristretto never reached the lowest espresso: 120.4–139.8 mg against 172.4–195.2 mg.

Starbucks US’ own menu says the same thing in its own numbers. Divide the caffeine by the shots in each recipe and every ristretto shot in its iced flat white works out at 65 mg, while every espresso shot in its iced latte works out at 75 mg, exactly the figure it states for one espresso (75 mg). The hot drinks give the same split: 65 mg a ristretto shot. The divisions are ours.

Divided by the shots in Starbucks US’ default recipes, each ristretto shot in an iced flat white works out at 65 mg at every size (130 mg for 2, 195 mg for 3, 260 mg for 4), and each espresso shot in an iced latte at 75 mg (75 mg for 1, 150 mg for 2, 225 mg for 3), the figure Starbucks states for one espresso. 51451547

Ristretto tastes stronger and carries less. Most relatable shot on the menu

So at Starbucks US the flat white wins on caffeine for one reason only: it gets one more shot than the latte at each size. Smaller shots, one more of them. For what a single shot holds at other chains (Peet’s says its own is about 70 mg), see how much caffeine is in a shot of espresso.

How much caffeine is in a Starbucks flat white?

In the US, 130 mg in a Short or a Tall and 195 mg in a Grande or a Venti. Those are 2 shots in the two small sizes and 3 shots in the two large ones, all ristretto, with whole milk. Same as with the latte, the step from 12 fl oz to 16 fl oz adds a shot, and the step from 16 fl oz to 20 fl oz adds only milk.

Australia does not follow the American staircase. Its flat white is 125 mg in a Short and in a Tall, 190 mg in a Grande and 250 mg in a Venti, so the Australian Venti goes up again where the American one stops. The page prints no shot count, so I will not guess one. In the UK, Starbucks sells one size, Short, at 89.1 mg.

A Venti latte is a glass of warm milk with a coffee alibi

Is an iced flat white stronger than an iced latte?

Yes, at every size Starbucks US sells it. The iced flat white has 2 shots at Tall, 3 shots at Grande and 4 shots at Venti; the iced latte has one shot fewer each time. In caffeine that is 130 mg against 75 mg, 195 mg against 150 mg, and 260 mg against 225 mg.

Note the Venti. The iced cup is 24 fl oz, not the hot 20 fl oz, and the iced recipes add a shot there that the hot ones do not. A Venti iced flat white at 260 mg is the strongest drink on this page, and it is the one that looks most like a milkshake.

What is the difference between a flat white and a latte?

Less milk and thinner foam. At every chain on this page that prints caffeine, more coffee too; Pret says its own has “the same kick” as its other espresso drinks. A latte is espresso with a lot of steamed milk and a thin layer of foam on top. A flat white has a higher share of coffee, with milk steamed to a fine, flat texture, and at Pret it is “made in a smaller cup”. Starbucks US sells both in the same four sizes. The guides agree on that much and little else. Past that, the name is not one recipe.

The same name, different recipes. Starbucks US makes its flat white with ristretto shots and whole milk. The Starbucks UK guide lists espresso roast twice among the ingredients of its semi-skimmed flat white, with no mention of ristretto, and names a ristretto shot only in its cortado and Ristretto Bianco. Caffè Nero in the UK calls its flat white “ristretto-based”. Pret says its flat white has “the same size Pret base” as its other espresso drinks, “made in a smaller cup”, and so “the same kick as our other espresso based coffees”. Starbucks Australia gives no shot count. 7149521522517

So a flat white made in London and one made in Seattle can share a name and not a shot. The one dependable rule is the same as for every milk drink: count the shots, ignore the cup. I found no primary source for where the flat white was invented, so this page does not tell that story.