Drip machines are the most common brewer in the world and the one most people set up by guesswork. There are only two numbers that matter: how much coffee, and how much water. Get them right and a forty dollar machine makes better coffee than a badly tuned pour over setup.
The ratio: 1:16
Sixty grams of coffee per litre of water. That is the standard, and it lands in the 1.3 to 1.45 percent TDS range that most people call normal strength. If your machine has a five cup reservoir, that is 750 ml and 47 g of coffee.
Stronger cups want 1:14 — about 71 g per litre. Lighter, tea-like cups want 1:17 — 59 g per litre. Outside that band you are no longer making drip coffee, you are making a concentrate or a tisane.
| Cups (150 ml) | Water | Coffee at 1:16 | Coffee at 1:14 |
|---|---|---|---|
| 2 | 300 ml | 19 g | 21 g |
| 4 | 600 ml | 38 g | 43 g |
| 6 | 900 ml | 56 g | 64 g |
| 8 | 1200 ml | 75 g | 86 g |
| 10 | 1500 ml | 94 g | 107 g |
| 12 | 1800 ml | 113 g | 129 g |
Your machine's cup markings are not 240 ml
Most drip machines label a cup as 150 ml, following the old European convention. Some use 125 ml. Almost none use the American 240 ml measuring cup. So when a recipe says twelve cups, it usually means 1.8 litres — not 2.9 litres.
Fill the reservoir with a measuring jug once, mark the real capacity on the side with a permanent marker, and stop trusting the printed lines. This single step fixes more bad drip coffee than any other change.
Measuring without a scale
A level tablespoon of medium-grind coffee is about 5 g. So 1:16 for a 300 ml cup is roughly four level tablespoons. It is not precise — roast level and grind size both shift the weight by up to 20 percent — but it is far better than filling the scoop and hoping.
If you drink drip coffee daily, buy a scale. Twenty dollars buys gram resolution and removes the guessing permanently. Coffee is the only ingredient in your kitchen where people routinely cook by volume and then wonder why it tastes inconsistent.
Grind and time
Medium grind, the texture of coarse sand. Drip machines typically run a four to six minute brew cycle, and medium grind extracts properly in that window.
Too fine and the bed clogs, the water backs up, and you get an over-extracted, bitter pot. Too coarse and the water runs straight through, giving you a sour, hollow cup no matter how much coffee you use.
Fixes ranked by impact
- Weigh the water — measure the actual reservoir capacity once
- Weigh the coffee — 60 g per litre, and adjust by two grams at a time
- Grind medium, not fine — pre-ground drip coffee is usually correct already
- Rinse the filter — removes paper taste, especially with cheap filters
- Descale monthly — mineral build-up changes both temperature and flow