More failed brews come down to the wrong amount of coffee than to any other single cause. The brewing ratio - how much coffee you use relative to water - sets the strength of the cup before grind, temperature or technique come into play. This guide explains what ratios like 1:15 mean, which ratio suits each method and how to adjust to your own taste. For the full picture of home brewing methods, read the Complete Home Coffee Brewing Guide.
What is a coffee brewing ratio?
A brewing ratio describes how much coffee you use relative to water, by weight. A 1:15 ratio means 1 gram of coffee for every 15 grams (millilitres) of water - so 20g of coffee brewed with 300ml of water. Written this way, a recipe works at any batch size: one cup or a full pot, the proportions stay the same.
Ratios matter because strength is the first thing you taste. Use too little coffee and the cup is thin and watery regardless of how well you brew. Use too much and it turns heavy and muddy. Getting the ratio right first makes every other adjustment - grind, temperature, timing - far easier to judge.
How much coffee should I use per cup?
For a standard 250ml cup of filter coffee, use 15 to 17 grams of ground coffee - a ratio between 1:15 and 1:17. A 1:15 ratio gives a stronger, fuller cup; 1:17 gives a lighter, more delicate one. If you are unsure, start at 1:16 (about 15.5g per 250ml) and adjust from there.
In spoon terms that is roughly two and a half level tablespoons of ground coffee per cup - though spoons are a rough guide at best, because grind size and roast level change how much coffee fits in a spoon. Weighing is the only reliable way, which is why a simple set of scales improves more brews than any other purchase.
What ratio should I use for each brewing method?
Filter methods share similar ratios. Pour over (V60 and Chemex): 1:15 to 1:17. Cafetière: 1:15 to 1:16, slightly stronger because the metal mesh lets body through. AeroPress: 1:15 to 1:17 for filter-style cups or as strong as 1:6 for concentrated espresso-style recipes.
Outside filter brewing the numbers change substantially. Cold brew uses around 1:8 to make a concentrate you dilute to taste. Espresso runs about 1:2 - 18g of coffee producing a 36g shot. Moka pot sits near 1:10, set largely by the size of the basket and chamber. Each method’s dedicated guide in this series covers its recipe in full - start with the V60 pour over guide.
Should I measure coffee by weight or by spoon?
By weight, every time you can. Coffee beans vary enormously in density: a tablespoon of a light-roasted, dense bean can weigh half as much again as a tablespoon of a dark roast. A spoon-based recipe that works for one bag can miss badly with the next.
Digital scales accurate to one gram cost little and remove all the guesswork. Weigh the beans before grinding, then weigh the water as you pour - 1ml of water weighs 1g, so a 1:16 recipe becomes simple arithmetic. If you brew without scales, keep using the same spoon and the same beans and accept a little variation from bag to bag.
How do I adjust the ratio to my taste?
Move in small steps. If the cup tastes weak, shift from 1:16 towards 1:15. If it tastes heavy or overwhelming, move towards 1:17. One point on the ratio is a noticeable change - there is rarely a reason to jump further in a single adjustment.
Be careful to distinguish weak from sour and strong from bitter. A sour, sharp cup usually needs a finer grind or longer brew, not more coffee. A bitter cup usually needs a coarser grind or shorter brew, not less. Our guide to coffee extraction explains the difference - it is the single most useful concept in home brewing.
Does the ratio change with different beans?
The ratio itself is stable across coffees - 1:16 is a sensible starting point for almost any bean brewed as filter. What changes is where within the range a coffee shows its best. Dense, complex single origins often reward a slightly lighter ratio that gives their flavours room, while comfort-focused darker roasts suit a stronger mix.
Naturally processed Yemeni coffees carry intense fruit and sweetness, so they stay expressive even at 1:17 - a good reason to experiment across the range with one bag rather than switching beans. Explore the Hamdan Coffee range and use one coffee to learn your own preference before you change anything else.
"We make the coffee simple as it is. We don't bring it as a juice - too many syrups, too much flavour, too much sweetness. The source of coffee should speak for itself."
- Ameen, Founder, Hamdan Coffee
A measured ratio serves the same idea. When the strength is right, nothing needs masking - no sugar to cover bitterness, no guesswork. The coffee tastes of where it was grown, at exactly the strength you chose.
What are the most common ratio mistakes?
The most common mistake is guessing. A "scoop" of coffee and a "cup" of water are both undefined - mug sizes in most kitchens range from 250ml to 400ml, which alone swings the strength of the brew by more than half. Weighing both coffee and water removes this entirely.
The second mistake is correcting the wrong variable: adding more coffee to fix a cup that is actually under-extracted or cutting the dose when the real problem is a grind that is too fine. Fix the ratio first, keep it constant and then tune grind and time. One variable at a time is the fastest route to a cup you can repeat every morning.
