How many grams of coffee per cup? Dosage per brewing method
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The same beans, the same machine, and yet your coffee tastes weak one morning and too strong the next. Usually, this is not due to the beans, but the dosage. How many grams of coffee per cup you need depends on two things: the actual size of your cup, and the brewing method you use. Below are the numbers per brewing method — and a way to measure your own scoop once, so you never need a scale again.
Calculate per liter, not per cup
Most dosing tips mention one number: seven grams per cup. That is only correct if your cup is exactly the size they mean, which is almost never the case. In dosing advice, a "cup" usually means 120 to 125 ml. The mugs most people use at home are closer to 250 to 300 ml. If you dose seven grams in those, you drink half the intended strength.
Therefore, work with a ratio instead of a fixed scoop. The Specialty Coffee Association uses about 55 grams of coffee per liter of water, with a margin of about ten percent up or down. So calculate with 50 to 60 grams per liter. Converted, that comes down to:
- cup of 125 ml: about 7 grams
- mug of 250 ml: about 14 grams
- large mug of 300 ml: about 16 grams
- full French press of 1 liter: 55 to 60 grams
- carafe of a coffee maker, 1.25 liters: about 70 grams
This ratio scales automatically with any size. You only need to remember one number.
How many grams of coffee per cup, per brewing method
Each method has its own ideal range because the grind size and contact time differ.
Filter coffee and coffee maker. Use 55 to 60 grams per liter. The water should be around 93 degrees, with a few degrees margin, and the brewing time may last four to eight minutes. If it takes longer, the grind is too fine.
French press (cafetiere). Here, dosing is often a bit more generous: 60 to 70 grams per liter. The grind is coarse, so less is extracted from the coffee in the same time. For a dark roast, dosing is often a bit lower; then start at the lower end of that range, around 60 grams.
Espresso. You dose espresso not per cup but by ratio. A double shot is usually 18 to 20 grams of ground coffee, from which 36 to 40 grams of liquid espresso flows in 25 to 30 seconds. That is roughly one part coffee to two parts espresso. If the shot flows faster, grind finer; if it flows too slowly, grind coarser. Keep the amount of coffee the same.
Fully automatic machine. Most machines have a strength slider that results in somewhere between seven and twelve grams per cup. If you want to know what yours actually does, set the slider in the middle and weigh the coffee that comes out relative to the water; then you know whether to go up or down.
The grind size determines how much is extracted from that gram of coffee. The article about grind size per brewing method explains which grind suits which method.
Measure your own scoop once
A scale is accurate, but no one wants to weigh every morning. That’s not necessary: you only need the scale once to calibrate your own mug and scoop. After that, you dose by feel and it still works.
- Place your empty mug on the scale and zero it. Fill it with water to the level you normally drink and read the weight. One gram of water equals one milliliter, so you immediately see the true volume of your mug.
- Multiply that volume by 0.055. A 280 ml mug thus corresponds to just over 15 grams of coffee.
- Scoop that amount with the scoop you always use and count how many scoops it is, and how full.
- Write both numbers down somewhere visible, for example on the storage container: "mug = 15 grams = two level scoops."
This calibration is worthwhile because a scoop is not a fixed measure. A level measuring scoop or level tablespoon of ground coffee weighs about six to seven grams, but a heaping tablespoon is already around ten grams. For whole beans it’s different: beans stack more loosely than ground coffee, so a scoop of beans weighs less than the same scoop of grounds. The grind size also changes how densely the powder packs in the spoon. Counting once solves all this in five minutes.
Too strong or too weak: adjust only one thing at a time
Dosage and grind size control two different things. Dosage determines how concentrated your cup is; grind size determines how much is extracted from the coffee. If your coffee tastes watery and thin, more coffee is usually the solution. If it tastes sharp or flat while the ratio is correct, the issue is in the grind or temperature, not the grams.
Therefore, never change two things at once. Stay within the range of 50 to 60 grams per liter, adjust in steps of one gram, and brew twice the same before adjusting again. Also keep in mind that freshness matters: older beans extract less, making the same dose weaker. How to prevent that is explained in the article about storing coffee beans. The order in which you adjust the rest — water, grind, time — is detailed in Level Up Your Brew.
Frequently Asked Questions
How many grams of coffee go into a 125 ml cup?
About 7 grams, based on the ratio of 55 grams of coffee per liter of water.
How many scoops of coffee do I need per cup?
One level measuring scoop or level tablespoon of ground coffee weighs six to seven grams and is enough for a cup of 120 to 125 ml; for a 250 ml mug you need two.
How many cups of coffee do you get from a kilo of beans?
At 14 grams per 250 ml mug, you get about 70 mugs per kilo, or five weeks of coffee if you drink two per day.
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Dosing is the cheapest tool you have: it costs nothing, you don’t have to buy anything, and you taste the difference the next morning. Weigh once, write down two numbers, and done. And if your beans need replacing: subscribe to the Dark Roast and save 10%.
