Palouse Coffee Club
What is coffee extraction?
Coffee extraction is the dissolving of flavor and other compounds out of ground coffee into hot water: acids, sugars and other carbohydrates, oils, the brown melanoidins made in roasting, and caffeine. How much comes out depends on water temperature, brew time, grind size and how much coffee you use. Get it right and the cup tastes balanced.
Three numbers that describe a brew
Wikipedia's coffee extraction article separates three ideas that are easy to mix up.
- Brew ratio: how much coffee to how much water, by weight.
- Strength: how much dissolved coffee is in the drink, as a percentage of the liquid, also called total dissolved solids or TDS. It is the difference between a watery cup and a heavy one.
- Extraction yield: how much of the ground coffee's own weight ended up dissolved in the drink. This is the number that tracks flavor balance.
An example from the same article: brew 18 g of coffee into a 36 g espresso with a strength of 10%, and the yield is 20%. For most traditional coffee drinks, a yield of 18% to 22% is the target. In North America a strength of 1.15% to 1.35% counts as typical for brewed coffee; Nordic drinkers go a little stronger, at 1.30% to 1.50%.
Under-extracted vs balanced vs over-extracted
| Under-extracted | Balanced | Over-extracted | |
|---|---|---|---|
| Extraction yield | Under 18% | 18% to 22% | Over 22% |
| How it tastes | Sour, thin, unbalanced | Sweet, rounded | Bitter, harsh |
| Why | Acids come out first; sugars and balancing bitters never catch up | Acids, sugars and bitters in proportion | Bitter compounds keep dissolving after the acids and sugars are gone |
| What to change | Grind finer or brew longer | Nothing | Grind coarser or brew shorter |
The ranges and flavor order come from Wikipedia's coffee extraction article, which also notes that advanced equipment can push yields past 22% without the usual bitterness.
How to steer extraction at home
Grind is the strongest lever. A finer grind has more surface area and extracts faster; a coarser grind extracts slower. Time is the second lever: the longer water and grounds stay in contact, the higher the yield. That is why each brewer pairs a grind with a time. A French press uses coarse grounds for 3 to 4 minutes, drip uses a finer grind and a shorter brew, and espresso uses a very fine grind for 20 to 30 seconds.
Two points save a lot of fiddling. First, if the cup is too strong or too weak but tastes balanced, change the ratio, not the grind: adding water after brewing changes strength and leaves yield alone. Second, a longer brew does not make coffee much more caffeinated, because caffeine comes out early.
Brewers who measure plot strength against yield on a brewing control chart, where a box in the middle marks coffee that is neither under- nor over-extracted, neither too weak nor too strong. Everyone else can taste: sour means go finer or longer, bitter means go coarser or shorter.
The Washington angle
Extraction starts before you grind, with how the coffee was roasted. Some Washington roasters we list write about that link on their own pages, checked September 27, 2026. Elm Coffee Roasters in Seattle roasts on the light side but says it aims for full development, so the cups come out sweet rather than grassy or sour, which is the same sour you taste in an under-extracted brew. Camber Coffee in Bellingham was founded by three licensed Q graders, the trained cuppers who score coffee quality.
Two roasters here also do the extraction for you. Olympia Coffee Roasting sells its Big Truck blend as instant coffee, and Kuma Coffee in Seattle makes specialty instant coffee from single origins. These are local favorites we list; a listing does not mean the roaster is part of the club. Buying from them keeps the roasting, and the know-how that goes with it, here in Washington. Why local roasters matter says more.
Club beans and extraction
If you like to dial in your own grind, choose whole bean in the plan builder. Each box is from a different Washington State roaster, so expect to nudge your grind a little with each new bag. If a bag still disappoints, our promise covers it: "Free replacement if a bag disappoints." $16.99 a bag; first bag free, you pay $7.99 shipping.
Related terms and sources
Related: espresso, ristretto, drip coffee, crema, brew ratio, TDS, grind size.
- Wikipedia: Coffee extraction (definitions, yield and strength ranges, grind and time)
- Specialty Coffee Association: Coffee standards (brewer and grinder specifications, SCA-310 and SCA-320)