The amount of ground coffee to use per cup or per liter often causes uncertainty. Yet there are straightforward, universally applicable rules that are easy to remember. In this article, you will learn everything about proper coffee dosage, the ideal brew ratio, the most reliable measuring method, and the universal filter coffee recipe.
Coffee Dosage is No Coincidence
The amount of coffee used is the foundational prerequisite for a balanced extraction. Whether brewing a classic filter coffee, a French press, or pulling an espresso, the proper brew ratio—the proportion of ground coffee to water—enables clean, even extraction. Extraction simply means water dissolving soluble compounds from ground coffee, which ultimately create the flavor in your cup.
The less coffee powder we use, the less can be dissolved by the water. The grind size of the coffee also plays a critical role in extractability, which we cover in detail elsewhere.
Little Coffee, Lots of Water – Over-Extraction
If we pour a large volume of water over a small dose of coffee and extract for an extended period—such as in a French press—the water dissolves a large portion of the soluble compounds from the coffee. The problem is that not all soluble coffee compounds taste pleasant. The longer and more aggressive the extraction, the more bitter the cup becomes. This so-called over-extraction leaves a dry, puckering sensation in the mouth, technically known as "astringency."
Due to the large volume of water, the coffee is simultaneously heavily diluted. Bitter, watery, dry? Everyone has experienced this. Not delicious at all!
Lots of Coffee, Little Water – Under-Extraction
If we pour very little water over a large dose of coffee, we get the exact opposite result. The limited water volume is insufficient to dissolve the desirable flavor compounds. We call this under-extraction. Under-extraction tastes unpleasantly sour and sharp. An under-extracted espresso can even have a distinct salty note.
Because so little water is used, the finished cup also contains little water. Although we dissolved too little from the coffee grounds overall, what did dissolve is suspended in very little water. The coffee is therefore quite strong due to the concentration of dissolved solids. In under-extraction, this concentrated strength translates to concentrated sourness in taste.
Both scenarios—too little coffee and too much coffee relative to water—share the same consequence: a lack of balance. Acidity and bitterness are out of harmony. Why? Because something essential is missing: sweetness! The coffee's natural sweetness is crucial for a harmonious, balanced, and delicious taste.
Let us embark on the search for sweetness—or the proverbial sweet spot—in the AeroPress, the V60, and across so many other brewing methods.
Brew Ratio as the Key to the Sweet Spot
Brewing coffee is neither rocket science nor voodoo. However, there are a few fundamental rules to follow. One of the most important is the brew ratio, which varies depending on the beverage category.
The brew ratio defines the relationship between the weight of dry ground coffee and water. 18 grams of coffee to 300 ml of water yields a brew ratio of 1:16.66.
Put another way, we can also talk about 6 grams of coffee per 100 ml or 60 grams per liter of water. To calculate the brew ratio, divide the amount of water by the dose of coffee used.
60 grams of coffee per liter is not a random example, but the gold standard recipe for all filter coffee methods. Whether using a classic Melitta dripper, a modern Hario V60, an automatic drip coffee maker, or a French press—60 grams per liter or 1:16.66 will consistently deliver great results.
How Much Ground Coffee for Filter Coffee?
The dosage for filter coffee is no coincidence; it is ultimately a balance of human taste preference and mathematics. Anyone drinking filter coffee has an expectation of taste rooted in sensory habit and perception.
When a coffee beverage reaches a specific strength, our palate recognizes it as filter coffee. This strength can be quantified, measured, and calculated.
Filter coffee tastes like proper filter coffee when it has a strength of 1.1% to 1.5% dissolved coffee solids (TDS). The rest, around 98%, is simply water.
To brew within this balanced strength range, you need a brew ratio between a minimum of 1:20 and a maximum of 1:14. Converted to dose, that equals at least 50 grams and at most roughly 72 grams per liter. In the video above, I even mention a 1:12 ratio as the highest concentration, though that requires a bypass of bypass water to dial back the strength.
How much ground coffee per 100 ml? Between 5 and 7.2 grams.
An average coffee cup holds about 150 to 200 ml of liquid. The dose should be calculated accordingly.
How Much Ground Coffee for Espresso?
Espresso is a short, concentrated beverage. Using pressure and high temperature, a high concentration of coffee compounds is extracted from a small dose of ground coffee.
Espresso also triggers a distinct sensory expectation. A classic espresso has a concentration of at least 7% dissolved coffee solids. Roughly 93% is water. Strong espressos reach double-digit concentrations of 10% or even 11% TDS.
To achieve a strength of at least 7%, the maximum brew ratio is 1:3.5 (for instance, 9 grams of ground coffee yielding 31.5 grams of liquid).
With espresso, the brew ratio is harder to measure at the input stage than with filter coffee. With pour-over, you can weigh the pour water directly. With a traditional espresso machine, that isn't possible because water flows directly from the group head through the coffee bed.
Therefore, in espresso, we weigh the liquid yield in the cup. The ratio of liquid espresso in the cup to the dry ground coffee used is known as the beverage ratio (or brew ratio).
Recommended Ratio for a Classic Espresso
A beverage ratio of 1:2 corresponds to 9 grams of coffee grounds yielding 18 grams of espresso; a 1:2.5 ratio corresponds to 9 grams of coffee grounds yielding 22.5 grams in the cup.
Inventions like capsule machines or bean-to-cup super-automatics have literally diluted what we traditionally knew as classic, dense espresso. These appliances brew with different ratios, altering the beverage's strength. Yet both claim to brew "espresso."
This has fundamentally shifted consumer taste expectations. In specialty coffee bars, more and more customers tell baristas that the espresso tastes "too strong." This is due to changed habits and perception.
Strength and Extraction – The Foundation of a Great Brew
In a detailed video, I explained the relationship between strength and extraction. Here is the summary: the relationship between strength and extraction is the prerequisite for great-tasting coffee.
Strength is the concentration of dissolved coffee compounds (TDS). Every beverage type has a characteristic strength profile.
We achieve this concentration by extracting coffee. Not everything soluble in a coffee bean is delicious or desirable. There is a sweet spot window we aim to extract: an extraction yield of 18% to 22%. Lower extraction results in the sour taste of under-extraction, while higher extraction leads to the harsh bitterness of over-extraction. The golden middle is balanced, sweet, and delicious—the "sweet spot" where everything is in harmony.
The ideal extraction yield is the same across all brewing methods, while the desired strength differs. This makes sense: across all brew methods, we only want to extract the delicious parts of the bean.
To achieve different beverage strengths, we simply adapt our coffee dosage and brew ratios.
| Beverage | Dosage | Ratio | Strength |
|---|---|---|---|
| Filter Coffee | 5–7.2 g per 100 ml (Standard: 6 g) | 1:20 to 1:14 (Standard: 1:16.66) | 1.1–1.5 % |
| French Press | 7 g per 100 ml | approx. 1:14 | – |
| Espresso | 9 g per single shot | 1:2 to 1:2.5 (Beverage ratio) | min. 7 % |
Why a Coffee Scoop Doesn't Make Sense
It is practically impossible to fill a scoop identically every time. Variations of a few grams happen easily and multiply with every scoop. If you use 9 grams instead of 7 grams per 100 ml for filter coffee, you inevitably cause under-extraction and harsh, sharp acidity.
Furthermore, coffee beans vary in weight and density depending on roast level and origin. A heaping tablespoon of light-roast coffee is significantly heavier than a heaping tablespoon of dark roast. Dark roasts expand in volume but lose density and mass.
Relying on volumetric spoons guarantees inaccurate dosing.
How Big is a Classic Coffee Cup?
A typical coffee cup holds about 150 to 200 milliliters. In cafes, these cups are often also used for cappuccinos. When hosting guests and planning how much coffee to brew, I recommend calculating 200 ml per cup.
We brew with the standard ratio of 6 grams of coffee per 100 ml of water. We want 4 cups of coffee, so we brew with 800 ml of water and 48 grams of coffee. For every gram of dry coffee used, approximately 2 grams of water are retained in the wet coffee bed. We therefore get 800 grams minus 2 × 48 g, leaving roughly 700 ml of liquid coffee—about 175 ml per cup. Perfect!
The rule of thumb that 2 grams of water are absorbed per gram of dry coffee applies specifically to gravity filter methods without pressure. In espresso and AeroPress brewing, retention values differ.
How Many Grams of Coffee for the French Press?
When friends visit, a French press is a great way to brew larger volumes of coffee at once. Also known as a cafetière, it belongs to the full immersion brewing methods. Water and coffee grounds remain in direct contact throughout the entire brewing time.
I like to brew a French press using 7 grams per 100 ml. Although water stays in contact with the coffee for 3 to 5 minutes, there is little turbulence after the initial stir, meaning extraction proceeds more slowly than in drip filter methods.
By dosing slightly higher, I maintain pleasant beverage strength. At the same time, the slower extraction yield brings out a touch of pleasant, sparkling acidity.
In a French press, pressing the metal mesh plunger separates the grounds from the brew. Unlike paper filters, coffee oils and fine micro-sediments remain in the cup, giving the coffee a heavier body and less transparency. The slightly lower extraction balances these oils. Higher extraction would emphasize bitterness.
Conclusion on Coffee Dosing
The ideal dose of coffee powder for any beverage method is largely determined by coffee's solubility and extraction dynamics. This is reassuring, as it gives us clear guardrails to follow.
Experimenting with coffee and different brewing methods offers endless creative freedom. By locking in your coffee dosage and brew ratio using these guidelines, you can focus on fine-tuning other crucial variables like grind size and water temperature.
