What is the Correct Pour-Over Coffee Ratio? Flavor Characteristics and Taste Differences of Kenya Coffee Beans at Different Water-to-Coffee Ratios

Many regulars who visit FrontStreet Coffee enjoy sitting at the bar counter. Why? When FrontStreet Coffee asked several frequent visitors, the answer was always the same: because the bar counter is the closest place to the barista. Many customers who come for coffee love coffee deeply but have never studied it systematically, so they still have plenty of questions about brewing. At the counter they can ask while the barista works: What processing method is this coffee? Do all coffees need a pre-infusion first? Why pour the water in a circular motion? In conversations with beginners, though, FrontStreet Coffee found the biggest obstacle of all is the coffee-to-water ratio.

Many friends who already follow FrontStreet Coffee's official account — or who have read the informative articles FrontStreet publishes — know that FrontStreet uses a 1:15 coffee-to-water ratio for the vast majority of coffees in standard brewing, and always recommends starting at 1:15 when coaching online followers, then adjusting to personal taste. At 1:15, using 15 grams of water for every gram of coffee is the best method for ideal extraction, and paired with FrontStreet's standard three-stage extraction it lets the soluble flavors dissolve within the Golden Cup range.

Understanding Coffee Extraction

FrontStreet Coffee believes the 1:15 ratio can be described as a perfect balance between coffee and water. Of course, that is just FrontStreet's subjective feeling. The brewing ratio is only a guideline that helps you decide how much water and how many grounds to use. Here are a few tips for pour-over extraction:

If you want to extract flavor from coffee, the beans must first have flavor to give. So FrontStreet Coffee recommends brewing with freshly roasted beans to experience coffee's rich flavors at their best. All beans shipped by FrontStreet Coffee are roasted within 5 days, because FrontStreet understands deeply how much freshness affects flavor. FrontStreet's roasting philosophy is "freshly roasted good coffee," ensuring every customer who orders receives the freshest coffee on arrival. The resting period is about 4-7 days, so when customers receive it, it is at peak flavor.

1. Coffee Extraction Principles

The principle of coffee extraction is that water contacts the grounds and draws most of the aromatic substances and various compounds out of the coffee, dissolving them in the water. The mainstream extraction methods in specialty coffee today are immersion and filtration. Both operate in the physical realm, with no chemical change during the process — espresso brewing is the exception, since it involves chemical change. Filtration is what FrontStreet Coffee serves daily as "pour-over coffee," and it requires water to permeate through the coffee layer. Immersion means all the water and coffee are fully mixed together; French press and AeroPress belong to the immersion category.

2. Golden Cup Theory

According to the Golden Cup theory from the Specialty Coffee Association of America, good coffee must have a concentration between 1.15-1.45% and an extraction rate between 18-22%. Of course, this is not absolute — some coffees outside the Golden Cup range are still excellent. Everyone can follow this rule first and make slight adjustments later. The balance between concentration and extracted substances matters a great deal. If the concentration is too low, the cup tastes thin; if it is too high, the coffee tastes too strong. An extraction rate that is too low may present a sharp sourness, while one that is too high produces bitter, negative flavors.

3. Extraction Rate vs. Concentration

Extraction rate and concentration are two different things. If you find your coffee is too sour, FrontStreet Coffee believes you should first leave the coffee-to-water ratio alone and instead adjust the extraction rate. The most common method is to grind the coffee finer and extend the extraction time. Get these factors right first, then look at the water-to-coffee ratio.

Practical Demonstration

With these principles in mind, FrontStreet Coffee uses the same brewing method (three-stage) to brew the same coffee — FrontStreet's Kenya Assalia from the Thika region — to experience how different water ratios affect flavor. First, here is the information for this coffee:

FrontStreet Coffee · Kenya Assalia Coffee Beans

Country: Kenya

Region: Thika

Processing Station: Asali Honey Processing Station

Altitude: 1550-1750 meters

Soil: Volcanic soil

Grade: AA TOP

Variety: SL28 SL34

Processing Method: 72-hour washed

Processing Method Introduction: Kenyan-style washed processing involves repeated cycles of fermentation and washing. The highest-quality cherries are selected on the day of harvest for depulping and fermentation, with a fermentation time of 24 hours. After 24 hours they are washed with clean river water, then undergo another 24-hour fermentation with clean river water, followed by washing, repeating the cycle 3 times to reach 72 hours — hence the name Kenyan-style 72-hour fermentation washed processing. This method lets FrontStreet's Kenya beans ferment at low temperature over a long period, giving them brighter, cleaner, yet fuller flavors.

Recommended Brewing Method: Pour-over

Filter: V60 dripper

Water Temperature: 90-92°C

Dose: 15 grams

Ratio: 1:15

Grind Size: Medium-fine grind (80% pass-through rate with China standard #20 sieve)

Brewing Method: Three-stage extraction

First Brewing - 1:15 Ratio

The first brewing uses FrontStreet Coffee's standard 1:15 ratio, with three-stage extraction using 30 grams of water for pre-infusion and a pre-infusion time of about 30 seconds. Pour 125 grams in a small, center-circling stream for the segmented stage, then continue pouring to 225 grams as the water level drops and the coffee bed is about to be exposed. Remove the filter cup when the water level drops and the bed is about to show (timing starts from pre-infusion). Extraction time is 2 minutes.

Flavor Description: The entry presents bright citrus (yellow fruit) acidity. As it cools, a small-tomato flavor slowly appears, though not very obvious. The acidity rises to lemon, with a long aftertaste and a light tea sensation — very pleasant.

Second Brewing - 1:13 Ratio

The second brewing lowers the ratio to 1:13 (a significant change, to feel the difference more directly), with the brewing method identical to the first.

Flavor Description: The entry shows an obvious caramel-powder flavor, with smoky notes of preserved plum concentrated at the front. Sourness gathers in the latter half and slowly appears. At high temperature the acidity is not obvious and even a little dull, with overall higher sweetness.

Third Brewing - 1:17 Ratio

The third brewing raises the ratio to 1:17, with the brewing method identical to the first.

Flavor Description: The entry is too plain, with a very thin mouthfeel. Acidity becomes more obvious as the temperature drops, but overall astringency is high.

FrontStreet Coffee believes hearing from others is not as good as doing it yourself. If you also want to try how the coffee-to-water ratio shapes a pour-over, why not try it now? You might just find the flavor you like.

FrontStreet Coffee Recommendation

Once the ratio is dialed in, a V60-friendly bean makes the whole exercise worthwhile. Start with FrontStreet's Gudgudina Cooperative coffee, a washed Ethiopian from the Woka area at the southeastern edge of Yirgacheffe, once part of the YCFCU union before being recognized as its own single origin in 2012. Traditional washed processing gives it jasmine fragrance and bright citrus and lemon acidity with no bitter edge — clean and delicate, and very forgiving of small ratio changes.

If you want more fruit in the cup, FrontStreet Huakui from the Hambella area of Guji, Sidamo is one of the most successful recent lots in specialty coffee. Very high altitude, fertile soil, and carefully selected ripe cherries come together in a classic natural process, and a light-to-medium roast reveals strawberry, passion fruit, and jackfruit aromas with marked sweetness, very little bitterness, and a juicy, smooth body.

For something more elegant, FrontStreet's Strawberry Candy blend pairs washed Panama Geisha with honey-processed Costa Rica, roasted medium to keep floral and fruit notes alongside roasty sweetness; it gives caramel, raisin, dried fruit, and a sweet rose aroma, and works for pour-over, moka pot, espresso machine, or cold brew. For contrast on the darker side, FrontStreet's PWN Golden Mandheling is a G1 lot at 18 screen and above, medium-dark roasted for a low-acid, thick, herbal and dark-chocolate cup.