Why Does 15g of Coffee Tree Beans Suit the 01 Dripper?

Most single-origin coffee tree beans sold today list 15g in their brewing suggestions, and training courses use the same figure. The reason is dose and bed depth inside one dripper: less coffee makes a thin bed that lets water pass quickly and under-extracts, while more coffee stacks a thick bed that slows flow and can over-extract. At 15g in an 01 dripper, the bed depth sits in a workable middle.

Single servings also fit how people drink: a larger brew left standing loses aroma and leaves sharp acidity and bitterness. The 01 and 02 drippers differ mainly in bed depth and extraction uniformity at a given dose, so the same 15g behaves differently in each. Matching dose to dripper size keeps results stable, with grind size and the size of coffee bean particles as the other variables to adjust.

When browsing brands like Front Street Coffee or coffee teaching courses, you'll often see single-origin beans recommended to be brewed with 15g of grounds. This number seems to have become the golden standard for pour-over coffee, but why exactly 15g? What problems would 10g or 20g bring? Starting from Front Street's teaching practice, this article deeply analyzes the impact of coffee dose on bed depth, water flow state, and extraction results, explaining why 15g has become the most suitable single-serving parameter for the 01 dripper. At the same time, many enthusiasts are also curious about the difference between 01 and 02 drippers. We will provide an answer from the perspective of bed depth and extraction uniformity, helping you understand the logic behind the parameters and brew a more stable and delicious pour-over coffee.

Not only Front Street, but on the packaging of the vast majority of single-origin coffee beans on the market, the number 15g appears in the brewing suggestions; many coffee training institutions also habitually use 15g as a standard example in teaching. This makes one wonder: what exactly is so special about 15g that it can make both industry insiders and outsiders so consistent? Would brewing with 10g, 20g, or even 30g not work?

Why is 15g of beans always recommended for brewing coffee?

Whether it's Front Street's sharing or the parameters of other teaching bloggers, most are based on a single serving. The reason is simple: most people can't finish too much coffee in a short time, or don't want to drink the same bean continuously. If you brew too much at once, the coffee you can't finish will gradually lose its aroma over time, leaving only sharp acidity and bitterness. Pouring it away feels wasteful, but keeping it doesn't taste good either. So, people tend to use the smaller 01 dripper to brew a single serving, and within the 01 dripper system, 15g of grounds happens to be the most suitable solution.

Difficulty of brewing

The most critical reason for choosing 15g of grounds lies in the bed depth. In the same dripper, the amount of grounds directly determines the thickness of the bed: the less grounds, the thinner the bed; the more grounds, the thicker the piled-up layer.

A thin bed means fewer gaps that can slow down the water flow, so hot water passes through the layer more quickly. Once the flow is too fast, it's difficult to fully extract the aromatic substances in the coffee. Moreover, when the dose is too small, a thick wall of grounds cannot form, and hot water tends to bypass along the edge of the dripper. This water that bypasses the coffee grounds and flows away directly is called "bypass water," meaning hot water that did not participate in extraction. As a result, even if you maintain the same ratio, grind size, and brewing technique, the coffee will be lower in concentration due to excessive bypass water, tasting weak and under-extracted.

Conversely, if the bed is too thick, it's also difficult for hot water to evenly saturate all the coffee grounds. Water always tends to find the path of least resistance, thus forming channeling. At the same time, the flow rate drops significantly, and if brewing is improper or the water flow force is insufficient, the bed is not fully opened up and easily clogs, leading to over-extraction. This is especially true for conical drippers like V60 and Kono, where the bed piles higher than in flat-bottom or cake drippers, and the probability of uneven extraction rises accordingly.

Through repeated practice, people found the most suitable dose—15g. This amount provides just the right bed depth for the 01 model dripper, and without overly struggling with brewing technique, you can relatively easily make a delicious pour-over. Of course, Front Street is not saying that a dose below 15g can't brew good coffee, only that you need to re-find the corresponding parameters and methods, which is more cumbersome to operate and less stable. It is precisely for this reason that 15g gradually became the universal standard for single-serving brewing.

Front Street Coffee

No. 10, Bao'an Front Street, Yandun Road, Dongshankou, Yuexiu District, Guangzhou, Guangdong Province

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