Coffee Ratio Calculator
Calculate how much coffee and water to use for a consistent brew from a ratio like 1:16, working from the water, the coffee, or the number of cups.
Cómo usar esta calculadora
- 1Choose whether you're starting from the water, the coffee, or a number of cups.
- 2Enter that amount.
- 3Set your brew ratio — lower for stronger, higher for milder.
- 4Read how much coffee and water to use, and weigh both on a scale for consistency.
Cómo funciona
Coffee brew ratio
coffee (g) = water (g) ÷ ratio water (g) = coffee (g) × ratio 1 ml water ≈ 1 g, so ml and g are interchangeable for water golden ratio ≈ 1:15 to 1:18 by weight
A brew ratio expresses how many parts of water go to one part of ground coffee, by weight. A 1:16 ratio means 16 grams of water for every gram of coffee, so the amount of coffee is simply the water divided by the ratio. Weight is used rather than volume because ground coffee's density varies with the bean, roast, and grind — a scoop can hold quite different masses — while a scale removes that variability entirely. Water is convenient here because one millilitre weighs almost exactly one gram, so a recipe in grams can be measured with a jug. The 'golden ratio' of roughly 1:15 to 1:18 produces a balanced cup for most brewing methods; a lower ratio makes a stronger, more concentrated brew and a higher one a milder cup.
Ejemplo resuelto
For 500 grams of water at a 1:16 ratio, you need 500 ÷ 16 = 31.25 grams of ground coffee — a little over six level tablespoons. Prefer it stronger? Drop to 1:15 and the same water calls for about 33 grams; go milder at 1:18 and it needs about 28.
Coffee Ratio Calculator: la guía completa
Why ratio beats scoops
The reason two people following the same recipe get different coffee usually comes down to measurement. A 'scoop' or 'tablespoon' of ground coffee is a volume, and the mass it holds depends on the roast, the grind size, and even how the grounds settled — a fluffy light roast and a dense dark one can differ by a third in weight for the same scoop. Brewing by a weight ratio eliminates this, because you are measuring the actual amount of coffee and water rather than an unreliable proxy.
A small kitchen scale is therefore the most cost-effective upgrade a home brewer can make, more impactful than a fancier machine. Weigh the coffee, weigh (or measure by volume, since water is one gram per millilitre) the water, and every brew becomes repeatable. Once a ratio tastes right, you can reproduce it exactly and scale it up or down for any batch size, which is precisely what this calculator automates.
Choosing a ratio for strength and method
The brew ratio is the main dial for strength. A lower number — more coffee per unit of water, like 1:14 — yields a stronger, more intense cup; a higher number like 1:18 gives a lighter, more delicate one. The widely cited 'golden ratio' of about 1:15 to 1:18 is where most people find balance, but taste is personal and there is no wrong answer, only preference. Start in that band and adjust a point or two until it suits you.
Method also shapes the ideal ratio. Pour-over and drip brewing sit comfortably in the golden range. Full-immersion methods like the French press are often brewed a touch stronger. Espresso is a different world entirely, using ratios around 1:2 because it is a concentrate, not a full cup. Cold brew goes the other way, using very high coffee doses (around 1:8) that are later diluted. The ratio you pick should match both your palate and the way you brew.
The other variables the ratio can't fix
A correct ratio gets you most of the way to good coffee, but it is not the only factor. Grind size controls how fast water extracts flavour: too coarse and the brew is weak and sour from under-extraction; too fine and it turns bitter from over-extraction, even at a perfect ratio. Grind should be matched to the method — coarse for French press, medium for drip, fine for espresso — and adjusted by taste.
Water temperature and brew time round out the picture. Water just off the boil, around 90–96°C, extracts well; cooler water under-extracts. Time interacts with grind and method, from a few minutes for pour-over to many hours for cold brew. Water quality matters too, since coffee is almost entirely water and heavily mineral or chlorinated tap water tastes through. The ratio gives you a reliable foundation; dialling in grind, temperature, and time on top of it is where a good cup becomes a great one.
Preguntas frecuentes
What is the ideal coffee-to-water ratio?
The 'golden ratio' of about 1:15 to 1:18 by weight — 15 to 18 grams of water per gram of coffee — suits most drip and pour-over brewing. A 1:16 ratio is a common balanced starting point. Lower ratios make stronger coffee, higher ones milder; adjust to taste.
How much coffee do I need for one cup?
For a 240 ml cup at a 1:16 ratio, about 15 grams of ground coffee (240 ÷ 16), which is roughly three level tablespoons. Scale up proportionally for more cups. Weighing on a scale is far more consistent than measuring by scoop.
Should I measure coffee by weight or volume?
By weight. The mass in a scoop of grounds varies with roast and grind, so volume measures are unreliable. A kitchen scale removes that variability and makes brews repeatable. Water can be measured by volume, since one millilitre weighs almost exactly one gram.
Why does my coffee taste bitter or sour at the right ratio?
The ratio isn't the only variable. Sourness usually means under-extraction — grind finer or brew hotter or longer; bitterness means over-extraction — grind coarser or brew cooler or shorter. Grind size, water temperature, and time all interact with the ratio to shape the final cup.