What Latte Milk to Coffee Ratio Works for Soy Milk?

Soy milk can be used to make a latte, and the same 1:5 ratio used for dairy milk works well. That means roughly 40 ml of espresso to about 200 ml of soy milk. Soy milk brings a strong, distinct aroma, often more pronounced than oat milk, so the drink tastes different from a dairy latte but remains drinkable and balanced.

The latte coffee meaning is simply espresso with steamed milk, and plant-based versions follow the same structure. Cafes rarely offer soy milk lattes even though soy milk counts as a plant-based milk, mainly because its flavor is assertive and can mask lighter coffee notes. The test used the standard latte milk to coffee ratio so results stay comparable to a regular latte.

Plant-based milk coffee has become increasingly popular in recent years, with alternatives to dairy milk such as oat milk and almond milk appearing frequently in cafés, yet the national drink, soy milk, is rarely used to make milk coffee. Soy milk is also a plant-based milk, so why do coffee shops almost never offer soy milk lattes? Is it due to flavor incompatibility, or is there another reason? This article will conduct practical tests, using soy milk instead of dairy milk to make lattes, analyzing aspects such as ratios, mouthfeel, and operational details, and sharing Front Street Coffee's testing process and conclusions to help coffee enthusiasts understand the feasibility and specific methods of soy milk coffee.

Since plant-based milk contains no lactose, many lactose-intolerant consumers can also comfortably enjoy the flavor of "milk coffee," which is why plant-based milk coffee has remained highly popular in recent years. To meet more people's needs, cafés have been adding plant-based milks such as oat milk and almond milk to their menus as replacement options for milk coffee.

For example, for an extra 5 yuan you can swap dairy milk for oat milk—similar practices have become very common. But the problem is: among such a rich array of choices, our most familiar national drink—soy milk—is conspicuously absent!

Plant-based milk is generally a grain beverage made from plant seeds (or fruits) rich in protein and fat combined with water as the base. By this definition, soy milk naturally counts as plant-based milk too. So why is it almost impossible to find a café using soy milk to make milk coffee? Is it because the flavors don't match? Or is it to avoid the awkwardness of "staple food paired with staple food"?

(Coffee is often jokingly called "the foreign soy milk," so soy milk plus coffee is essentially soy milk plus "soy milk"! But in fact, the only thing the two have in common is the character "bean" in their names; beyond that, they are vastly different, so this is purely a joke.)

Rather than speculating, it's better to just test it directly: what kind of result would using soy milk instead of dairy milk to make a latte actually produce?

Can soy milk be used to make "latte coffee"?

In terms of ratio, since soy milk itself has a very strong flavor and an aroma even more pronounced than oat milk, Front Street Coffee used the same ratio as a regular latte here: 1:5, meaning 40ml of espresso and about 200ml of soy milk.

(Left is dairy milk, right is soy milk)

The above content is compiled by CoffeeHunters, a coffee news website.