How does the pour-over coffee ratio shape extraction?

The pour-over coffee-to-water ratio sets concentration and extraction before any other variable. A common starting point is 15 grams of grounds at 1:15, pouring 225 milliliters of hot water in total. More water lowers concentration and thins the taste while raising extraction yield; less water concentrates flavor and body. Choosing a ratio based on bean characteristics comes first, then temperature and grind follow.

Staged pouring controls how those variables unfold. Front Street stores break the process into three pours, using a medium grind, water temperature around 88 to 89 degrees Celsius and a V60 dripper for reference. Beginners can build a repeatable framework from these fixed numbers, then adjust one element at a time. Knowing what are the characteristics on which coffee is judged? means judging the cup against aroma, acidity, sweetness and body.

The charm of pour-over coffee lies in the flexibility to adjust various parameters, and the coffee-to-water ratio is the core variable that determines concentration and extraction effectiveness. This article starts from the definition of the coffee-to-water ratio, analyzes the impact of water volume on concentration and extraction yield, explains how to choose an appropriate ratio based on bean characteristics, and breaks down in detail the principles and operation methods of staged pouring. Using the commonly used 15g dose and 1:15 to 1:16 ratio at Front Street stores as an example, along with parameters such as water temperature and grind size, it provides a three-stage brewing method suitable for beginners, helping enthusiasts build their own brewing framework.

What makes pour-over coffee so appealing is that it allows us to adjust various subtle parameters, changing the extraction variables at different stages, and ultimately achieving the flavor and mouthfeel we prefer. Front Street has always believed that the coffee-to-water ratio is an extremely critical element in pour-over brewing. Mastering it not only makes the extraction process more stable but also elevates the flavor expression to a higher level.

What exactly does the pour-over coffee-to-water ratio mean?

During the pour-over process, hot water acts as a solvent when it contacts the coffee grounds, extracting the soluble flavor compounds from within the coffee. The coffee-to-water ratio refers to how much water we use to dissolve these substances. It is essentially the ratio between coffee grounds and total water volume, directly determining the strength of the coffee. Regardless of which brewing method is chosen, Front Street always determines the coffee-to-water ratio before extraction. For example, when Front Street stores serve a single cup, they typically use 15g of coffee grounds at a 1:15 ratio, pouring a total of 225ml of hot water.

If other conditions remain unchanged, the more water poured, the lower the coffee concentration, and the taste becomes more spread out; the less water poured, the higher the concentration, and the flavor becomes more concentrated and full-bodied. At the same time, the more water poured, the higher the extraction yield, with more substances dissolved. (Extraction yield refers to the percentage of soluble substances extracted from coffee grounds relative to the dry coffee weight.) However, the more water poured toward the end, the extraction efficiency gradually decreases, and it easily brings out undesirable bitter compounds, affecting the final taste. Therefore, finding the right coffee-to-water ratio is the only way to adjust both concentration and extraction yield to an ideal state.

How to determine the optimal coffee-to-water ratio?

The coffee-to-water ratio is usually judged by experience, with no hard and fast rules. For example, when Front Street stores serve Jamaican Blue Mountain coffee, they choose a 1:15 ratio to present a balanced taste; when serving Hacienda La Esmeralda sun-dried Red Label coffee, Front Street wants a clearer flavor and brighter acidity, so they switch to 1:16 for extraction. Based on Front Street's past brewing experience, friends new to pour-over are advised to start between 1:15 and 1:18, which means 15g of coffee grounds per single serving corresponds to 225 to 270ml of water.

The coffee-to-water ratio is not the only factor determining coffee flavor. We also need to understand other parameters: extraction time, water temperature, grind coarseness, pouring technique, and the characteristics of the dripper and filter paper all affect the final taste. Once you begin to learn the relationships between the various pour-over parameters, variables that were originally fixed, such as the coffee-to-water ratio and water temperature, will become variables you can flexibly adjust to make better-tasting coffee.

Why pour in stages?

We often see baristas pausing mid-pour during pour-over, waiting for the water level to drop before continuing to pour. This is staged extraction.

The first stage involves pouring a small amount of hot water to wet the coffee grounds, with the purpose of releasing gases from the coffee bed to avoid interfering with subsequent extraction. This step is called "blooming." The most common approach is to pour water at twice the weight of the coffee grounds and let it bloom for 30 seconds. For example, if Front Street uses 15g of coffee grounds, they pour 30ml of water for blooming. This is also the "blooming formula" that beginners can most easily master. Staged pouring is classified by whether there is a pause after blooming: if you pour in two stages after blooming, plus the bloom, that makes "three-stage pouring," and so on; if you pour continuously without pausing after blooming, it is called "one-pour."

Baristas use staged extraction because different substances extract at different rates during the pour-over process. The order in which hot water releases flavors is acidity, sweetness, then bitterness. In staged pouring, apart from the blooming stage, under the same coffee-to-water ratio, the more stages there are, the less water per stage, and the more times the coffee bed is flushed and agitated, which increases the extraction yield.

In addition, more stages lengthen the total extraction time, dissolving more substances at each stage, resulting in richer flavor layers. But Front Street would like to remind you: the more stages, the longer the operation time, and the greater the risk of over-extraction. Large-molecule substances in the later stages of coffee are more easily released, which can mask the sweetness. It is clear that more pouring stages is not always better. So how should staged pouring be calculated?

The three-stage pour-over method is recommended

Based on past brewing experience, Front Street recommends that beginners just starting out use three-stage pouring. Three-stage extraction helps dissolve flavor substances more fully during brewing, adding mouthfeel layers while avoiding over-extraction caused by excessive steeping time. If using 15g of coffee grounds with a 1:15 coffee-to-water ratio and a total water volume of 225ml, the three stages can be divided as follows: 30ml, 95ml, 100ml. The weights shown on the scale would then be: 30g, 125g, 225g.

Here, Front Street selects its own roasted washed Yirgacheffe Gedeb Cooperative coffee beans, paired with a Hario V60 dripper for brewing. The V60's spiral rib design allows coffee grounds to degas better, maximizing the volatilization and dissolution of aromatic compounds. Since Yirgacheffe is a light roast, the beans are relatively hard and require hot water at 92°C to 93°C to bring out their floral and fruity notes.

Regarding grind size, Front Street recommends a medium-fine grind (78% passing through a Chinese standard No. 20 sieve), with a coarseness close to fine granulated sugar. If the grind is too coarse, it cannot extract the rich, rounded flavor substances, and the brewed coffee will taste thin; if the particles are too fine, it is prone to over-extraction at high water temperatures, causing bitterness in the coffee.

For the brewing ratio, Front Street believes that 1:15 to 1:16 both work. If you prefer a richer mouthfeel, use 1:15; if you want to perceive the floral and sweet notes more clearly, use 1:16 to let the flavors unfold more fully.

First, place the folded filter paper into the dripper, wet it with water so it adheres to the dripper, discard the water in the server, pour 15g of ground coffee into the dripper, and then tare the scale to zero.

For the first stage, pour 30g of water to bloom for 30 seconds, starting the timer as you pour. Throughout, use a slow stream of water, pouring from the center point and circling outward, making sure to wet the entire coffee bed.

After 30 seconds, use a slightly stronger steady stream to pour the second stage of 95g of water, with the aim of lifting the entire coffee bed. The water column should be poured vertically and evenly. At this point, the scale should read 125g, and the pour should be completed in about 55 seconds.

When the water level drops to the halfway point, begin pouring the third stage of 100g with a slow stream in small circles, trying to control the flow so it is not too strong, to avoid disturbing the coffee bed and causing under-extraction. The total water volume is 225g, and the drip completes in about 2 minutes. After removing the dripper, swirl the coffee in the server to mix it evenly, and it is ready to taste.

The water volume for each stage is not fixed. We can adjust it based on our accumulated pour-over experience and our understanding of the coffee beans. Front Street understands coffee brewing as an experiment grounded in science. To learn pour-over well, you need to deeply understand the true meaning behind each brewing parameter. Only then can you find the method for experimentation and build a brewing framework that suits you.

For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat official account: cafe_style)

For more specialty coffee beans, please add the private WeChat of Front Street Coffee (FrontStreet Coffee), WeChat ID: qjcoffeex

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