There is no unified quantitative standard for coffee grinding, so enthusiasts often use everyday ingredients as analogies to quickly convey the concept of particle size. Common reference points like fine granulated sugar, coarse granulated sugar, sea salt, fine salt, and flour each correspond to different brewing methods and roast levels. This article goes through the particle size characteristics and suitable scenarios for each of these analogous grinds one by one: fine granulated sugar is mostly used for light-roast pour-over, coarse granulated sugar suits medium-dark roast beans, sea salt-like texture is suitable for immersion extraction methods like the French press, fine salt-like texture serves the fast-paced extraction of the moka pot, and flour-like texture is divided into two categories: espresso and Turkish coffee. The grind size described by each analogy is a range, not a single fixed value, and understanding this point helps with more flexible grind adjustment. [more…]

Grind size is the key variable that determines the success or failure of coffee extraction, and different brewing devices have significantly different requirements for particle diameter. This article systematically sorts out the corresponding grind settings from French press to espresso machine, introduces the industry-recognized cupping standard and the No. 20 sieve pass rate as calibration references, and provides specific scale references for the EK43s grinder. Whether you prefer immersion or pour-over, you can find suitable grind parameters here. The article also specifically reminds readers that coffee bean density and roast level will affect the actual particle coarseness at the same setting, so it is recommended to repeatedly confirm with the same beans. Several Front Street Coffee beans are also used as examples throughout to help readers understand the logic of grind adjustment more intuitively. [more…]

When extracting espresso, you may occasionally notice a layer of fine black sediment at the bottom of the cup, and many people worry that this indicates an equipment malfunction or spoiled coffee. In reality, these black particles are simply coffee fines—extremely small particles that can easily pass through the holes in the portafilter basket and mix into the coffee liquid under high pressure. At first they hide within the crema, and only as the bubbles burst do they sink to the bottom of the cup and become visible to us. Moka pots also use pressure extraction, so a similar situation can occur. Although coffee grounds are a woody fiber, the extremely fine particle size and tiny intake amount pose no health risk, so you can drink with complete peace of mind. This article explores the origins of fines, whether the portafilter basket will deform, and fine particle size, helping coffee enthusiasts better understand these common phenomena. [more…]

How should you determine the grind size for pour-over coffee? This is the first challenge many coffee enthusiasts encounter when getting started. This article systematically introduces three methods for judging grind size—visual analogy, grinder setting reference, and sieve calibration—analyzing the pros, cons, and applicable scope of each, and further introduces the advanced concept of "particle size distribution" to help understand how grind uniformity affects extraction. At the same time, Front Street Coffee, drawing on its own brewing framework, shares how to combine visual observation, data, and brewing tests to find the pour-over grind size that suits you in a more practical way. [more…]

Grind size selection is a key factor determining coffee extraction quality. Because espresso uses high-temperature, high-pressure, short-time extraction, its requirements for particle fineness and uniformity are far higher than those of other brewing methods. This article will sort out the extraction principles of espresso from the beginning, explain why the grind particle size needs to be controlled within the 150–300 micron range, and detail how to calibrate the grind setting through flow-rate observation and taste judgment. It also provides specific daily grind adjustment steps, including debugging methods, coffee-to-liquid ratio references, and adjustment strategies for common problems such as bitter burnt notes, thin crema, and a short finish, helping coffee enthusiasts and professionals quickly find suitable grind parameters. [more…]

Grind size is the key variable that determines the direction of coffee flavor, but how coarse counts as coarse and how fine counts as fine has always lacked a unified standard. This article uses the industry-recognized cupping grind as a baseline, and with the help of the passing rate through a No. 20 standard sieve, quantifies the grind requirements for French press, pour-over, cold brew, ice drip, and even espresso machines one by one, and also includes reference settings for the EK43s grinder. The article also specifically reminds readers that differences in coffee bean density and roast level will cause the same setting to produce different particle sizes, and finally provides Front Street Coffee's espresso extraction plan as a debugging example to help enthusiasts turn grinding from an empirical judgment into a reproducible data-driven operation. [more…]

Faced with the dazzling array of coffee grinders on the market, many coffee enthusiasts find themselves paralyzed by choice. In truth, the coffee world has never had a single standard—different burr sets each have their strengths and weaknesses. Starting from burr types, this article takes a deep dive into the structural differences between flat burrs, conical burrs, and ghost-tooth burrs, along with their real-world impact on particle shape, extraction results, and final flavor. It also includes practical grind-setting parameters for commonly used models such as the Fuji Royal, Feiying, and Zheng Huang Hang, helping you find a grinding approach that suits your brewing method and taste preferences. [more…]

As the "legendary machine" in the specialty coffee world, the Mahlkonig EK43 has long since risen from a single-origin grinder to a standard fixture in espresso cafés, thanks to its outstanding grind uniformity and extraction performance. From early experiments at Café Myriade in Montreal in 2009 to Matt Perger's endorsement on the world competition stage in 2013, the EK43 was gradually elevated to iconic status. Meanwhile, Ditting, another "high-end grinder," is often compared with the EK43, with each having its own strengths in burr layout and flavor profile. This article reviews the grind settings and structural differences among the EK43 series versions (EK43S, EK43T, EK43, EKK43), traces its rise to fame, and compares the design features of Ditting's horizontal flat burrs. Combined with Matt Perger's particle experiment data, it analyzes why the EK43 can achieve more uniform extraction. Front Street Coffee will also share related product recommendations in this article. [more…]

Grind size plays a decisive role in coffee extraction, directly affecting the dissolution efficiency of flavor compounds. Once coffee beans are ground into powder, their surface area can expand by about a thousand times. The finer the grind, the shorter the distance water must travel to reach the core of the particle, and the faster the extraction. Different brewing methods require different grind sizes, but due to the influence of equipment and bean varieties, there is no unified standard for grind size—only vague descriptions such as coarse sugar, fine sugar, or flour-like texture can be used to classify it. This article will systematically analyze the principles by which grind size affects extraction and outline the suitable grinding ranges for espresso and pour-over coffee respectively, helping enthusiasts build a clear understanding of grinding. [more…]

Water temperature, grind size, and coffee-to-water ratio are the three key variables that determine coffee extraction. Among them, grind size directly affects the particle size and uniformity of coffee grounds, which in turn influences how efficiently water passes through the coffee bed to extract flavor compounds. The finer the grind, the more tightly packed the coffee bed, the more resistance to water flow, and the longer the extraction time, so strength and extraction yield climb, producing a strong but easily bitter cup; the coarser the grind, the larger the gaps in the coffee bed, the smoother the water flow, and the lower the extraction yield, resulting in a weak, light-bodied coffee. This article uses grind size as the only variable, brewing three groups of coffee—fine, medium, and coarse—with Honduras Lychee Orchid beans, verifying grind size's effect on flavor through strength and extraction yield data, and providing Front Street Coffee's recommended hand-brew grind baseline, while also explaining the differences in characteristics among conical, flat, and ghost-tooth burrs. [more…]

How coarse exactly should you grind for pour-over coffee? Many beginners are told the answer is "about the size of granulated sugar," but that description is not very helpful for those just starting out. Drawing on the daily experience of Front Street Coffee (FrontStreet Coffee), this article first explains the specific size range of granulated sugar particles, then explains why grind size directly affects extraction results, and afterward gives the ideal particle range of 0.6mm to 0.8mm along with the practical method of an 80% pass rate through a 0.85mm standard sieve. The article also combines two criteria for judgment—brewing time and the settling speed of the coffee bed—and uses Honduras Sherry beans as a sample to compare the cupping concentration differences between two grind settings, BG #8s and BG #3s, helping readers build a quantifiable way of thinking about grind adjustment. [more…]

Grind size is a core variable in pour-over coffee that cannot be avoided, as it simultaneously affects the contact area between water and coffee grounds and the extraction rhythm, thereby determining the flavor direction in the cup. This article starts with coffee bean freshness and resting, explains the difference in extraction yield between fine and coarse grounds, and describes the corresponding taste performance when the grind is too fine or too coarse. It also introduces the method of calibrating grind with a 0.85mm cupping sieve, as well as Front Street Coffee's comparison table of applicable equipment organized by five levels—extra fine, fine, medium-fine, medium, and coarse—to help you find the appropriate grind range across different roast levels and brewing tools. [more…]

Many people, after drinking an Americano or espresso, notice some fine black particles settling at the bottom of the cup—are these actually coffee grounds? And why are they rarely seen in iced drinks? Drawing on Front Street Coffee's practical experience in production, this article explains the sources of very fine particles in espresso extraction, including grinding particle size, the mesh of the portafilter basket, and cleaning of the group head, and offers four actionable improvement measures. The article also records the results of Front Street's test of placing a circular filter paper in the portafilter basket—although it effectively intercepts fine particles, the extraction flow rate and flavor change, requiring readjustment of the grind and dose parameters. [more…]

Grind size is one of the most critical variables in pour-over coffee—it determines the contact area between water and coffee grounds, and also influences extraction time and the final flavor. This article will systematically sort out the logical relationship between grind size and extraction yield, tell you what kind of taste will appear in the cup when the grind is too fine or too coarse, and also introduce how to use a 0.85mm sieve to calibrate the passing rate, and give specific grinding recommendations for beans with different roast levels. If you do not want to buy an extra sieve, the article also categorizes five levels—extra fine, fine, medium-fine, medium, and coarse—so you can quickly find the right setting by comparing it with your own brewing device. [more…]

The first step in coffee brewing often begins with grinding. Different extraction methods have different requirements for coffee grounds: a French press needs coarse particles visible to the naked eye, while a Turkish pot requires a grind as fine as flour. At the same weight, the finer the grind, the greater the number of cuts and the larger the surface area, and the more opportunities water has to contact the coffee grounds, so flavor compounds are released faster. To move away from vague descriptions like "as coarse as granulated sugar," Front Street Coffee uses standard sieves to calibrate particle size: generally, pour-over coffee particles are between 600-850 microns; when tested with a 0.85 mm (No. 20) sieve, the pass rate is about 80% for light roasts and about 65-70% for medium-dark roasts. This article will also compare the pass rates of common methods such as cold drip, siphon, moka, American drip filter, cupping, and French press, and introduce the effects of conical burrs, flat burrs, and ghost teeth burrs on grinding results, as well as recommendations for choosing between hand grinders and electric grinders. [more…]

With its hundred-yuan price tag and simple operation, the moka pot has become the top choice for many coffee lovers looking to brew rich coffee at home. But can coffee brewed in a moka pot have a rich layer of crema? And how should you control the grind size of the coffee grounds? From the perspective of a Front Street Coffee barista, this article offers a detailed analysis of the moka pot's extraction principles, the particle size requirements for coffee grounds, suitable coffee bean choices, and key cleaning points after use, helping you fully unlock the potential of this Italian national coffee device and brew a cup of coffee that is both rich and smooth. [more…]

Among the many variables in pour-over coffee, grind size is a key link that determines the direction of extraction. Particle size directly affects the contact area between water and coffee grounds, which in turn influences flavor expression: too coarse leads to under-extraction, while too fine may cause over-extraction and bitterness. However, many beginners often fall into pitfalls when adjusting the grind—memorizing settings, making drastic grind adjustments, and ignoring uniformity. This article will start from the basic principles of grinding, analyze these common problems one by one, and with the help of Front Street · Little Tomato's comparative test, demonstrate the actual differences between electric grinders and hand grinders in particle distribution and flavor presentation, and finally provide purchasing advice for entry-level equipment to help coffee enthusiasts establish a scientific approach to grind adjustment. [more…]

In the practice of pour-over coffee, fines are often seen as the culprit behind clogging and bitterness, and many people have thus developed the habit of always sifting out fines before brewing. But do fines really only have negative effects? From the perspective of Front Street, this article systematically sorts out the definition of fines, their generation mechanisms, and their actual contribution to flavor, explaining why in most cases it is unnecessary to completely sift out fines, and under what conditions sifting should really be considered. At the same time, the article also explores the relationship between coffee bean brittleness, grinder quality, and the amount of fines, helping readers build a more complete understanding of extraction. [more…]

Fines in pour-over coffee are always a double-edged sword: retaining them can bring complexity, but they can also easily cause clogging and over-extraction; discarding them entirely can improve consistency, but it makes the flavor seem flat. Front Street Coffee, combining its own experiments with online discussions, first explains why fines need to be sifted out, then provides two practical solutions—one is to control the amount added back to within 10% of the total dose and reduce the water volume accordingly; the other is to add the fines after the second pouring stage to reduce the risk of negative flavors. The article also records measured data from sifting 2.5 g of fines from 15 g of grounds, and notes that high-precision grinders also produce fines; the key is proper management rather than simply removing them. [more…]

Faced with the dazzling array of coffee grinders on the market, beginners often don't know where to start. This article, from the perspective of Front Street, systematically sorts out three core approaches to choosing a grinder: power source, price tier, and burr structure. The article first distinguishes the applicable scenarios and pros and cons of hand grinders versus electric grinders, then divides hand grinder tiers by budget and the timing for getting into electric grinders, and reminds readers that electric grinders for espresso and single-origin coffee cannot be used interchangeably. Finally, it provides an in-depth analysis of the grinding methods of flat burrs, conical burrs, and ghost tooth burrs, and their impact on coffee particle shape, particle size distribution, and final flavor. Whether you are a student just getting started or an advanced player with a sufficient budget, you can find a purchasing direction that suits you. [more…]