What is the Standard Grind Size for Pour-Over Coffee? How to Accurately Find the Right Grind Size?

If most home brewers struggle to make good coffee, the first suspect is usually not their technique but their coffee grind size. This is something FrontStreet Coffee has stressed time and again, because in the vast majority of cases, it is simply the truth.

Extraction rate and concentration are the two variables that determine whether a pour-over tastes good. During brewing, four factors control them: grind size, ratio, time, and water temperature. Each factor's settings influence the extraction rate, so to pull a delicious cup out of your beans, you need the right combination of extraction parameters.

Of those four factors, only grind size is invisible to the eye; the other three can all be observed directly. So when you use the same beans and water, the same brewer, and seemingly identical parameters, yet your pot of coffee never tastes quite as good as the shop's, don't second-guess yourself—the problem is almost certainly the grind (and far less likely that you brewed it wrong).

Because particle size is hard to judge, most people fall back on sight and touch, comparing grounds to fine sugar, coarse sugar, and so on. That kind of description isn't reliable: the range is too broad, everyone's idea of "sugar-sized" differs, and what a pile of grounds looks like on the surface tells you little about the actual distribution. So how do you pin down the right grind accurately? Try the three methods FrontStreet Coffee shares below.

The Sieve Measurement Method

"A certain percentage passing through a #20 sieve" is a figure FrontStreet Coffee cites frequently. It comes from measuring grounds with a #20 sieve, and compared with other methods it gives you an objective standard, which keeps the error small when brewers compare notes. Since everyone runs different grinders and different beans, a specific grind cannot be conveyed simply by naming a model and a setting number. Even two identical grinders on identical settings can produce grounds of different coarseness as the burrs wear. The #20 sieve provides relatively dependable data: two brewers on completely different equipment can each dial in until they hit the same passing rate, and they will be brewing at a similar grind.

The #20 sieve has an aperture of 0.85 millimeters and a two-layer box design. Using it is simple: place a measured amount of grounds in the sieve and shake until nothing more passes through, then weigh what fell through. For example, if FrontStreet Coffee loads in 10g of grounds and 7g passes, that grind has a 70% passing rate. Anyone who wants your grind only needs to adjust until they also reach 70%—this works with any grinder and any beans.

For reference, here are the grinds FrontStreet Coffee uses for pour-over: hot brews are ground to an 80% passing rate through the #20 sieve, while cold brew goes finer, at an 85% passing rate. The sieve method does have limits, though—it can only separate particles larger or smaller than 0.85mm. In "How Much Does Coffee Bean Grinding Affect Extraction?", FrontStreet Coffee pointed out that grinding always produces grounds of mixed sizes. Even a top-tier grinder cannot achieve perfect uniformity; the best it can do is keep most particles within a certain range. (Below is a sample ground on an Ek43, which FrontStreet Coffee separated into large, medium, and small particles with sieves.)

So when you use a lower-quality grinder, or one with dull burrs, the grounds come out very uneven. Even if your passing rate matches someone else's, the taste can still differ noticeably. In that situation, FrontStreet Coffee recommends relying on the other two methods instead.

Water Flow Speed and Extraction Time

The coarseness and uniformity of the grounds directly shape how fast water drains during brewing. Coarser grounds drain faster; finer grounds drain slower. Flow speed in turn governs contact time between water and coffee—the longer the extraction, the higher the extraction rate, and vice versa. With every other parameter fixed, then, you can read the coarseness of your grind straight off the flow speed.

Take FrontStreet Coffee's own baseline: for a light-roast pour-over we use 15g of coffee, 92°C water, a 1:15 ratio, and a total extraction time of 2 to 2.5 minutes. If your brew lands outside that window, adjust the grind—since everything else is fixed, the grind is the only lever that moves extraction time. Water running too fast means grind finer; water draining too slowly means grind coarser. It really is that simple.

Of course, judging a cup by extraction time alone is not fully reliable, so pair it with the third criterion: taste.

Taste

As FrontStreet Coffee said at the outset, extraction rate matters because it represents how much of the coffee's soluble material has dissolved—and those solubles are what carry flavor. Too much or too little dissolved, and the coffee's positive attributes suffer. By tasting carefully, you can tell whether the grind should move finer or coarser.

FrontStreet Coffee covered the underlying principles in "Coffee Tastes Bad? Teach You How to Distinguish Between Over-Extraction and Under-Extraction," so here is the short version. When too little dissolves, the coffee is under-extracted: without enough sweet and bitter compounds to balance the acids, the cup turns sharply sour, the body feels thin because there simply isn't enough in it, and there is virtually no aftertaste. If your coffee tastes like this and nothing else has changed, grind finer to raise the extraction rate.

If the coffee tastes full but shows harsh, astringent bitterness, it is almost certainly over-extracted. With the other parameters unchanged, coarsen the grind to lower the extraction yield so the bitter and astringent compounds can't dissolve in excess. All of these techniques assume your grinder performs consistently. If it is truly poor, or the burrs are badly worn, it will shed enormous amounts of fines that clog the bed during extraction—replace the grinder. You can also compensate by adjusting other parameters, but that demands a deeper command of extraction theory, so how you choose to proceed is up to you.

FrontStreet Coffee Recommendation

Light Roasts for Fine-Tuned V60 Brewing

A precise grind only pays off with beans worth dialing in. For light roasts, FrontStreet Coffee recommends our Ethiopia Yirgacheffe Gudding—a longtime favorite and a classic first step into specialty coffee, with vivid citrus, berry, and floral notes and a green-tea-like sweetness. If you want something more dramatic, the FrontStreet Ethiopia Hambela delivers intense tropical fruit—strawberry, passion fruit, jackfruit, even lychee—with pronounced sweetness and almost no bitterness, which is why many drinkers call it "the coffee that doesn't taste like coffee." For an occasional splurge, the Panama Esmeralda Estate Red-Label Geisha offers elegant jasmine, bergamot, and black-tea nuances with a clean, lingering finish.

Medium-Dark Roasts for a Fuller Cup

If your palate leans toward body and sweetness rather than bright acidity, grind a touch coarser and try the FrontStreet PWN Indonesian Golden Mandheling: low acidity, a thick and enduring mouthfeel, herbal and dark chocolate notes with a faint earthiness. The FrontStreet Jamaica Blue Mountain No.1 is another superb match—it balances acidity, sweetness, and bitterness beautifully, with cream, caramel, chocolate, nut, and honey tones, and is often described by industry veterans as "the easiest specialty coffee for most people to love." Both reward the careful grind calibration described above.