Master coffee to water ratios for pour over, French press, espresso, cold brew, and more. Simple formulas, practical tables, and the science behind why ratio matters.
The ratio of coffee to water is the most fundamental variable in brewing. Get it right and everything else becomes easier to dial in. Get it wrong and no grind adjustment or technique will fix the cup.
The good news: ratio is the easiest variable to control. You just need a scale.
The Specialty Coffee Association recommends a ratio of 1:16.67 — roughly 60 grams of coffee per liter of water. This has become the "golden ratio" that most coffee education references.
It's a fine default. But it's just that — a default. Different brew methods, roast levels, and personal preferences call for different ratios. A 1:16 pour over tastes very different from a 1:16 French press, because the extraction mechanics are different.
Here's what actually works for each method.
| Method | Ratio (Coffee:Water) | Coffee | Water | Notes |
|---|---|---|---|---|
| Pour Over (V60, Kalita) | 1:15 to 1:17 | 15g | 225-255ml | Start at 1:16 |
| Chemex | 1:15 to 1:17 | 30g | 450-510ml | Thicker filter absorbs oils |
| French Press | 1:14 to 1:16 | 30g | 420-480ml | Full immersion extracts more |
| AeroPress | 1:12 to 1:16 | 15g | 180-240ml | Varies wildly by recipe |
| Espresso | 1:1.5 to 1:2.5 | 18g | 27-45ml | Yield, not input water |
| Moka Pot | 1:7 to 1:10 | 20g | 140-200ml | Fill to valve line |
| Cold Brew | 1:5 to 1:8 | 100g | 500-800ml | Concentrate; dilute to serve |
| Cupping | 1:16.67 | 11g | 183ml | SCA standard |
These ratios use grams for coffee and milliliters for water. Since 1ml of water weighs approximately 1g at brewing temperature, you can weigh both on the same scale.
A tablespoon of light roast coffee weighs more than a tablespoon of dark roast — dark roasting drives off moisture and expands the bean. Volume measurements introduce error that compounds with every scoop.
A $15 kitchen scale eliminates this entirely. Weigh your coffee. Weigh your water. The results become repeatable.
If you don't have a scale yet, a rough conversion: one level tablespoon of whole bean coffee weighs approximately 5-6 grams. Two tablespoons per 6oz cup is the traditional American guideline, which works out to roughly 1:14 — a bit stronger than the SCA recommendation.
The most common home scenario. You want one cup (roughly 250ml of brewed coffee):
The Brew Calculator does this math instantly for any method and dose.
French press works well for multi-cup brewing:
Espresso ratios work differently. The ratio describes the relationship between the dry coffee dose and the liquid yield in the cup — not the total water pushed through the puck.
Most specialty shops pull a 1:2 ratio in 25-30 seconds. This is the starting point for home espresso. Adjust grind to hit the target time, then adjust ratio to taste.
Cold brew uses a strong ratio because extraction is slow at low temperatures:
A 1:5 concentrate diluted 1:1 gives you an effective ratio of about 1:10 in the cup — strong but smooth, without the bitterness that hot brewing can introduce.
A common misconception: "stronger ratio = stronger coffee." In terms of concentration, yes. But strength and extraction are different things.
Strength is how much dissolved coffee solid is in your cup (measured as TDS — total dissolved solids). A 1:14 ratio produces a stronger cup than 1:18.
Extraction is what percentage of the coffee's soluble material you dissolved. You can have a strong, under-extracted cup (bitter + sour + concentrated) or a weak, well-extracted cup (balanced but thin).
Ratio controls strength. Grind size, time, and temperature control extraction. You want both dialed in: adequate strength at proper extraction. This is why ratio and grind work together — the Brew Calculator helps you set both variables for your chosen method.
Roast level affects how readily coffee gives up its soluble material:
Light roasts are denser and harder to extract. They benefit from:
Dark roasts are more porous and extract quickly. They benefit from:
These are guidelines, not rules. Your taste is the final arbiter. But if you're finding light roasts sour or dark roasts bitter, adjusting ratio alongside grind is often the fix.
Ratio assumes your water is suitable for brewing. The SCA recommends water with 75-250 ppm total dissolved solids. Too soft (distilled or reverse osmosis) and coffee tastes flat — there aren't enough minerals to bond with flavor compounds. Too hard and you get chalky, muted flavors.
Most filtered tap water falls in the acceptable range. If your coffee consistently tastes flat regardless of ratio, water quality is worth investigating.
For most people, most of the time:
Start there. Adjust by 1 gram of coffee at a time until it tastes right to you. Write down what works — the best recipe is the one you can repeat.
Need help calculating your exact ratio? The Brew Calculator handles the math for any method, dose, and cup count. Pair it with the Grind Converter to get your grind dialed in too.
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