Last updated: May 2026
The perfect cup starts with the right ratio. Enter your brew method, coffee amount or water amount — get instant, precise measurements for every brew style.
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Quick Scale — Cups of Coffee
The ratio is everything. Coffee ratio is expressed as 1:[X] where X is the parts of water per part coffee. A 1:15 ratio means 1g coffee per 15g water. Lighter ratios (1:17–1:18) produce weaker, more delicate cups. Stronger ratios (1:12–1:13) produce concentrated, bold results.
Why weight, not volume? Coffee grounds are inconsistent in density — a tablespoon of light roast weighs less than a tablespoon of dark roast. Using grams eliminates this variable. If you do not have a scale, the tablespoon conversion above is a reasonable approximation.
Water temperature matters: Optimal extraction temperature is 195–205°F (90–96°C). Boiling water (212°F/100°C) can over-extract and create bitterness. Let your kettle sit for 30 seconds off boil. Cold brew is the exception — room temperature or refrigerator temperature, 12–24 hours.
⚠️ Ratios are starting points. Adjust to taste — grind size, roast level, water quality, and brewing technique all affect the final cup.
The coffee-to-water ratio is the single biggest variable you can control in brewing. Grind size, water temperature, and brew time matter, but if the ratio is wrong, no amount of technique fixes the taste. Too much water relative to coffee = watery, weak, under-extracted. Too little water = dense, bitter, over-concentrated.
Ratios are expressed as 1:X, where the first number is coffee (by weight in grams) and the second is water (in grams or milliliters — they're the same for water). A 1:15 ratio means 1 gram of coffee per 15 grams of water. Specialty coffee's "Golden Ratio" standard is 1:15 to 1:17 for most filter methods, though espresso is much more concentrated at 1:2.
| Method | Typical Ratio | Coffee for 300ml | Strength Notes |
|---|---|---|---|
| Espresso | 1:2 | — | 18–20g coffee → 36–40ml shot |
| Moka pot | 1:7 | 43g | Strong, not espresso |
| French press | 1:12 – 1:15 | 20–25g | Rich, full body |
| Pour over / V60 | 1:15 – 1:17 | 18–20g | Clean, bright, nuanced |
| Drip machine | 1:15 – 1:18 | 17–20g | Everyday standard |
| AeroPress | 1:10 – 1:16 | 19–30g | Versatile — adjust to taste |
| Cold brew | 1:5 – 1:8 | 38–60g (concentrate) | Dilute 1:1 before drinking |
How many grams of coffee per cup?
A standard "cup" in coffee context is 6 fl oz (180ml), not the US 8 fl oz measuring cup. At a 1:15 ratio, that's 180 ÷ 15 = 12g per 6 oz cup. For a 12 oz mug (355ml): 355 ÷ 15 = 23.7g, call it 24g. If you're using tablespoons instead of a scale: 1 level tablespoon of ground coffee weighs approximately 5–7g depending on grind size and roast level.
Why does weighing coffee matter more than using scoops?
Volume measurements are inconsistent — a "scoop" of finely ground coffee is significantly denser than a scoop of coarsely ground coffee, even at the same volume. A tablespoon of espresso grind might weigh 7g; the same tablespoon of French press grind might weigh 5g. A kitchen scale removes that variable entirely. Entry-level coffee scales cost $10–15 and make a noticeable difference in consistency.
What is the SCA (Specialty Coffee Association) Golden Ratio?
The SCA recommends 55g of coffee per 1,000ml of water (1:18.2) as a starting baseline for drip brewing. This produces a Total Dissolved Solids (TDS) of around 1.2–1.45% — the range associated with optimal extraction flavor. Most specialty roasters and cafes brew closer to 1:15–1:16 for a stronger cup. The "Golden Ratio" isn't a fixed number — it's a starting point to adjust from based on your taste.
Why does cold brew use so much more coffee?
Cold brew is typically made as a concentrate (1:5 to 1:8) and then diluted 1:1 before drinking, effectively bringing it to a 1:10 to 1:16 final ratio. Cold water extracts coffee more slowly and less efficiently than hot water — you need more coffee and more time (12–24 hours) to reach proper extraction. Trying to make cold brew at a regular 1:15 ratio produces very weak, watery coffee.
What's the difference between coffee ratio and coffee strength?
Ratio (how much coffee per water) and extraction (how much of the coffee dissolves into the water) are two separate things. You can have a high-ratio brew that's over-extracted and bitter, or a low-ratio brew that's under-extracted and sour. Ratio determines concentration potential; grind size, temperature, and brew time determine how much of that potential is realized. Adjust ratio for overall strength, adjust other variables for flavor quality.