Coffee-to-water ratio.
The first number every brewing guide gives you. The starting point for every recipe. Here's what each ratio actually means, when to change it, and why ratio alone never makes a great cup.
Standard ratios: 1:2 espresso (18 g → 36 g), 1:16 pour over (15 g + 240 g water), 1:15 batch brew (60 g + 900 g), 1:4 cold brew concentrate. Ratio sets strength range. Grind and extraction determine taste inside that range.
What ratio actually means
Brew ratio is the proportion of dry coffee to water (or beverage). A 1:16 ratio means 1 gram of coffee per 16 grams of water — for filter brews. For espresso, it's 1 gram of coffee to 2 grams of liquid in the cup, not 2 grams of water in.
The difference matters: in filter coffee, the bed retains 25–35% of the water you pour, so beverage weight is always less than water added. In espresso, virtually all the water becomes beverage. That's why espresso ratios are by-beverage and filter ratios are typically by-water.
The standard ratios by brew method
| Method | Ratio (dose : water/beverage) | Typical example |
|---|---|---|
| Ristretto | 1:1 – 1:1.5 | 18 g → 18–27 g beverage |
| Espresso (modern normale) | 1:2 | 18 g → 36 g beverage |
| Lungo | 1:2.5 – 1:3 | 18 g → 45–54 g beverage |
| Pour over (V60, Origami) | 1:16 | 15 g + 240 g water |
| Pour over (lighter) | 1:17 – 1:18 | 15 g + 255–270 g water |
| Pour over (stronger) | 1:14 – 1:15 | 15 g + 210–225 g water |
| Chemex | 1:16 | 30 g + 500 g (3-cup) |
| AeroPress (standard) | 1:13 – 1:15 | 15 g + 200 g water |
| AeroPress (concentrate) | 1:6 – 1:8 | 17 g + 100–140 g water |
| French press | 1:15 – 1:17 | 30 g + 450–510 g water |
| Batch brew | 1:15 – 1:17 | 60 g + 1000 g water |
| Cold brew (concentrate) | 1:4 – 1:8 | 200 g + 800–1600 g water |
| Cold brew (ready-to-drink) | 1:10 – 1:14 | 100 g + 1000–1400 g water |
How to convert between ratios
If your scale only does grams (most do), the math is simple:
Water = Dose × Ratio
Examples:
- 15 g coffee × 16 = 240 g water (1:16)
- 20 g coffee × 15 = 300 g water (1:15)
- 30 g coffee × 17 = 510 g water (1:17)
For espresso (by beverage):
Beverage = Dose × Ratio
- 18 g × 2 = 36 g espresso (1:2)
- 20 g × 2.2 = 44 g espresso (1:2.2)
Ratio vs. extraction — different jobs
Ratio is one of the most-discussed variables in coffee, but it's not the variable that usually decides whether the cup tastes good. Ratio sets a strength range:
- Tighter ratio (1:14–1:15): stronger, more saturated cup. Higher TDS.
- Standard ratio (1:16): balanced. The default for most pour overs.
- Looser ratio (1:17–1:18): lighter, more transparent. Lower TDS.
But within any of those ranges, the cup can still taste sour (under-extracted) or bitter (over-extracted) depending on grind, temperature, agitation, and water. Extraction yield — the percentage of grounds that actually dissolved into the cup — is what controls taste. Ratio just sets the volume of the playing field.
That's why competition baristas tune grind to taste first and only change ratio when the cup is balanced but they want more or less strength. Read more about extraction →
When to change ratio
- Cup tastes balanced but weak. Tighten ratio by 1 point. 1:17 → 1:16.
- Cup tastes balanced but overwhelming. Loosen by 1 point. 1:15 → 1:16.
- Cup tastes sour and thin. Don't touch ratio. Grind finer first.
- Cup tastes bitter and harsh. Don't touch ratio. Grind coarser first.
- Switching brew method. Reset to the standard for that method, don't carry V60 ratios into AeroPress.
Ratio across roast levels
- Light roasts: often prefer lower ratios (1:15–1:16) to extract enough strength to balance their bright acidity.
- Medium roasts: the 1:16 default works for almost everything.
- Dark roasts: often want looser ratios (1:17–1:18) to avoid pulling out too much bitterness.
Auto-calculated ratio on every brew.
Enter dose and water; HomeBarista logs the ratio with the recipe. Free on iOS.
