Coffee-to-Water Ratio Calculator
Coffee is a ratio, not a guess. Tell the calculator what you are brewing and how much you want, and it returns the exact dose — in grams, tablespoons and scoops — along with the water to pair it with. No account, no email, no math.
Coffee-to-water ratio calculator
How the coffee-to-water ratio works
A ratio like 1:16 means one gram of coffee for every sixteen grams of water. Grams, not spoons, because a tablespoon of dense light-roast beans and a tablespoon of airy dark roast are not the same amount of coffee — the difference can run 15–20%. Water is easy: one millilitre of water weighs one gram, so 500 ml of water is 500 g and needs about 31 g of coffee at 1:16.
Two things go wrong when people skip the ratio. Too little coffee and the water pulls everything it can out of the grounds, including the bitter compounds that should have stayed behind — that is over-extraction, and it tastes harsh and hollow. Too much coffee for the water and the brew stops short: sour, thin, salty at the edges. Most ‘this coffee is bad’ verdicts are actually ratio problems.
Ratios by brew method
| Method | Start here | Workable range | Why |
|---|---|---|---|
| Drip / auto maker | 1:16 | 1:15–1:17 | The all-purpose ratio. Forgiving of grind error. |
| Pour-over | 1:16 | 1:15–1:17 | Same dose, more control over the pour. |
| French press | 1:15 | 1:14–1:16 | Slightly stronger — grounds keep some liquid when you plunge. |
| AeroPress | 1:14 | 1:13–1:15 | Short, concentrated brew by design. |
| Moka pot | 1:10 | 1:9–1:11 | Near-espresso strength, meant to be sipped small or cut with water. |
| Cold brew concentrate | 1:8 | 1:7–1:9 | Concentrate. Dilute roughly 1:1 with water or milk before drinking. |
Espresso is deliberately missing. It is not a brew ratio in the same sense — it is a ratio of liquid out to coffee in, usually 1:2 (an 18 g dose pulling 36 g of espresso), controlled by grind and pressure rather than by how much water you pour.
The ‘cup’ problem
The single most common reason a coffee maker’s numbers do not match a recipe: a drip-maker ‘cup’ is 5 fluid ounces, not 8. A 12-cup machine makes 60 oz, which is about seven real mugs. If you have been dosing a 12-cup pot as though it held 96 oz, you have been brewing weak coffee for years and blaming the beans.
| Machine setting | Actual water | Coffee at 1:16 | Roughly |
|---|---|---|---|
| 4 cups | 20 oz / 591 ml | 37 g | 7½ tbsp |
| 6 cups | 30 oz / 887 ml | 55 g | 11 tbsp |
| 8 cups | 40 oz / 1,183 ml | 74 g | 15 tbsp |
| 10 cups | 50 oz / 1,479 ml | 92 g | 18½ tbsp |
| 12 cups | 60 oz / 1,774 ml | 111 g | 22 tbsp |
Dial it in from here
Brew the calculator’s number first, taste it black, then move one variable. If it is thin and sour, add coffee or grind finer. If it is heavy and bitter, pull coffee back or grind coarser. Change one thing at a time or you will never know which one worked.
Two variables sit underneath the ratio and quietly decide whether it lands: grind size and water temperature. And the one nothing can fix — if the beans were roasted four months ago, no ratio on this page will save the cup. That is the whole reason we roast after you order.
Common questions
How many tablespoons of coffee per cup?
About 1½ level tablespoons (7–8 g) per 5 oz drip-maker cup, or about 3½ tablespoons (18 g) per 12 oz mug. Tablespoons are an approximation — a level tablespoon of ground coffee runs roughly 5 g, but that shifts with roast level and grind, which is why the grams figure above is the one to trust.
What is the golden ratio for coffee?
The Specialty Coffee Association’s golden cup standard works out to roughly 1:18 — about 55 g of coffee per litre of water, give or take 10%. Most home brewers find that a touch light and land between 1:15 and 1:16, which is where this calculator starts.
How much coffee for a 12-cup pot?
About 111 g — roughly 22 level tablespoons, or 11 standard two-tablespoon scoops — for the full 60 oz at 1:16. Cut it to about 98 g if you like it milder.
Does grind size change the ratio?
No, but it changes the result. Grind controls how fast water pulls flavour out; the ratio controls how much coffee there is to pull from. Keep the ratio fixed while you adjust grind, or you are chasing two variables at once.
Should I measure by weight or by volume?
Weight, if you own a scale — a cheap kitchen scale is the single biggest upgrade to a home cup. Volume is fine for daily brewing once you have weighed your usual dose a few times and know what it looks like in the basket.
Why does my coffee taste bitter even at the right ratio?
Usually one of three things: the grind is too fine for the method, the water is above 205 F, or the beans are old and the roast character has flattened into ash. Rule out the beans first — it is the variable people check last and the one that most often turns out to be the culprit.