Coffee machine recipe: 71 g of medium ground coffee to 1,200 g of water (1:17), about an 8 cup pot on most machines. Let the machine run a full cycle.
What a coffee maker "cup" really means
This is the part that trips most people up. The cup markings on a drip coffee maker are not 8 oz measuring cups and they are not mugs. Most machines count a cup as 5 or 6 fl oz of water, and the exact size varies by brand. So a "12 cup" coffee maker makes about 60 to 72 fl oz, which fills roughly five or six real mugs.
That is why "one scoop per cup" so often brews a weak or uneven pot. If you scoop for 12 mugs but fill to the 12 line, or scoop for 12 lines and pour into big mugs, the ratio drifts. The fix is to measure the water you actually use, then match the coffee to it.
Your manual or the carafe itself usually says what the maker counts as a cup. If you cannot find it, a measuring jug and one fill to the 4 line will tell you in a minute.
How much coffee for 4 to 12 cups
This table assumes a 5 fl oz machine cup, the most common size, and a 1:17 ratio. If your machine uses 6 fl oz cups, add about a fifth more coffee to each row, so a 12 cup pot takes about 125 g.
| Machine cups | Water | Coffee at 1:17 | Scoops, roughly | Tablespoons, roughly |
|---|---|---|---|---|
| 4 cups | 590 g (20 fl oz) | 35 g | 3 and a half | 7 |
| 6 cups | 885 g (30 fl oz) | 52 g | 5 | 10 |
| 8 cups | 1,185 g (40 fl oz) | 70 g | 7 | 14 |
| 10 cups | 1,480 g (50 fl oz) | 87 g | 8 and a half | 17 |
| 12 cups | 1,775 g (60 fl oz) | 104 g | 10 and a half | 21 |
Scoop and spoon counts assume a standard 2 tablespoon coffee scoop holding about 10 g of medium ground coffee, so about 5 g per level tablespoon. Spoons vary and so does grind, which is why a scale is the better tool. The calculator above starts at 1,200 g of water, a full 8 cup pot rounded up, and shows 71 g of coffee.
Why 1:17, and when to change it
Most drip brewing lands between 1:15 and 1:18. We start at 1:17 for a coffee machine because it gives a clean, balanced pot that is easy to drink a second mug of. A machine brews at a fixed speed and temperature, so the ratio is one of the few things you control.
- Tastes weak or watery: move toward 1:15 by adding a few grams of coffee.
- Tastes heavy or harsh: move toward 1:18 by using a little less coffee.
- Tastes bitter even at a light ratio: the grind may be too fine, or the coffee may be sitting on the hot plate.
- Tastes sour or hollow: the grind may be too coarse, or the machine may not be getting hot enough, which often points to scale buildup.
Use a medium grind, about the texture of sand. If your machine has a cone shaped basket, a slightly finer grind can help. Brewing a half pot in a large machine often tastes thinner, because the water runs through a shallow bed of coffee. Some machines have a small batch setting for exactly this.
How to brew a pot, step by step
This is the calculator's default pot, about 8 cups on most machines.
- 71 g medium ground coffee
- 1,200 g fresh cold water
- Fill the reservoir with 1,200 g of fresh cold water.
- Put a paper filter in the basket and add 71 g of medium ground coffee, then shake it level.
- Start the machine and let it run a full cycle without pausing it.
- Stir the carafe once so the strong first drips and the lighter last drips mix evenly.
- Pour it soon, or move it to a thermal carafe instead of leaving it on the hot plate.
Fresh cold water tastes better than water that has sat in the reservoir overnight. If your tap water tastes of chlorine, filtered water makes a noticeable difference, because coffee is almost entirely water.
Why the hot plate hurts flavor
The warming plate under a glass carafe keeps the coffee hot by heating it from below, and it never stops. The longer coffee sits there, the more it cooks. Bright, sweet flavors fade first, and the pot turns flat, bitter, and a little burnt tasting. Leaving the lid off makes it worse as the coffee reduces.
The better options are simple. Brew only what you will drink soon, turn the plate off once the cycle ends, or pour the pot into a preheated thermal carafe. A thermal carafe keeps coffee hot without adding more heat, so it holds its flavor far longer.
Cleaning and descaling basics
Old coffee oils and mineral scale are the two things that make a good machine taste bad.
- After every pot: empty the grounds, rinse the basket, and wash the carafe. Coffee oils build up into a film that tastes stale and rancid.
- Every week or so: wash the basket, carafe and lid in warm soapy water and let them dry fully.
- Every 1 to 3 months: descale. Hard water leaves mineral deposits inside the heater that slow the brew and lower the water temperature.
To descale, follow your manual first, since some makers ask for a specific product. A common method is to fill the reservoir with equal parts white vinegar and water, run half a cycle, let it sit for about 30 minutes, then finish the cycle. Run two or three full cycles of plain water afterward to rinse out the vinegar. A citric acid descaler works the same way with less smell. If your machine has a clean light, it will tell you when it is due.
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