Coffee to Water Ratio Chart
Brew ratio is the single most reliable lever for fixing a cup that tastes weak, bitter, or thin, and every brew method has its own working range. This chart lists the standard ratio for each method along with a concrete gram measurement, so you can start from a known reference rather than guessing.
Ratios by brew method
Pour over (V60, Chemex, Kalita): 1:15 to 1:17. For a single cup, 20g coffee to 320g water sits at 1:16, the most common starting point.
French press: 1:12 to 1:15, brewed coarser and stronger to account for the full-immersion method. 30g coffee to 450g water is a typical 1:15.
AeroPress: 1:12 to 1:16 depending on style, with concentrate-and-dilute recipes going as strong as 1:6 before adding water to taste.
Espresso: 1:2 for a standard modern shot, meaning 18g of ground coffee yields about 36g of liquid espresso. Ristretto runs tighter at roughly 1:1.5, lungo looser at 1:3.
Moka pot: roughly 1:7 to 1:10, filling the basket level without tamping and the boiler to just below the valve.
Cold brew concentrate: 1:4 to 1:8, steeped 12-24 hours, then diluted 1:1 or more with water or milk when serving.
Why grams beat scoops
Coffee beans vary enormously in density depending on roast level and origin: a scoop of light-roast dense beans weighs meaningfully more than the same scoop of dark, puffed-up beans. That variation is enough to shift a brew from balanced to sour or bitter.
A scale reading to 0.1g removes this variable completely. Weighing both the coffee and the water (1ml of water = 1g, so a scale replaces a measuring jug) is the single change that makes a recipe repeatable day to day.
Adjusting when the cup tastes wrong
Sour, thin, lacking sweetness: this is under-extraction. Grind finer, extend the brew time, or use slightly hotter water before touching the ratio.
Bitter, harsh, drying: this is over-extraction. Grind coarser or shorten the brew time.
Balanced but simply too weak or too strong: that is the ratio, and the fix is more or less coffee for the same water. Separating strength (ratio) from extraction (grind and time) is the key diagnostic skill, because adding more coffee will not fix a sour cup and grinding finer will not fix a watery one.
Water temperature and grind by method
Most methods work best at 90-96°C / 195-205°F. Off-boil water poured after resting 30 seconds lands in this range without a thermometer.
Grind coarseness scales inversely with contact time: espresso (25-30 seconds) is finest, pour over (2-4 minutes) is medium, French press (4 minutes) is coarse, and cold brew (12+ hours) is coarsest. If you change the ratio but keep everything else the same, the grind usually needs a small adjustment too.