Coffee-to-Water Ratio Calculator

How Coffee-to-Water Ratios Work

A coffee-to-water ratio compares the mass of dry coffee with the mass of brewing water. A 1:16 ratio means one gram of coffee for every 16 grams of water:

• 15 g coffee to 240 g water;
• 18 g coffee to 288 g water;
• 30 g coffee to 480 g water.

Because one millilitre of water weighs almost one gram, the calculator shows brewed-coffee water in millilitres while a scale can measure the same number in grams.

Coffee Ratio by Brewing Method

These are reliable starting ranges, not fixed laws. Coffee, grinder, roast and personal taste still matter.

Method	Starting ratio
Filter Coffee	1:15–1:17
Pour Over	1:15–1:17
French Press	1:15
AeroPress	1:12–1:16
Espresso	1:2 beverage yield
Moka Pot	Set by basket and reservoir capacity
Cold Brew	1:8–1:12
Cold Brew Concentrate	1:4–1:6

For Moka Pot, fill the coffee basket level without tamping and add water to just below the safety valve. A universal ratio would be misleading because the brewer’s construction fixes both capacities.

For everyday filter coffee, 60 g per litre is an easy number to scale: 15 g coffee for 250 ml water, 30 g for 500 ml or 60 g for one litre.

Stronger vs Weaker Coffee

Using more coffee with the same amount of water usually creates a stronger drink. Using less coffee usually creates a weaker one.

• Stronger: choose the lower second number, such as moving from 1:16 to 1:15.
• Balanced: begin at the method’s middle ratio.
• Lighter: choose the higher second number, such as moving from 1:16 to 1:17.

Strength is not the same as extraction. A coffee can be strong and sour when extraction is too low, or weak and bitter when extraction is too high. Use ratio to set concentration, then adjust grind size and technique for flavour balance.

Ratio Examples for 1, 2 and 4 Cups

This example treats one cup as 250 ml brewed water at a balanced 1:16.7 filter ratio.

Cups	Coffee	Water
1 cup	15 g	250 ml
2 cups	30 g	500 ml
4 cups	60 g	1,000 ml

Scale both coffee and water together. Doubling only the water makes the drink weaker; doubling only the coffee makes it stronger and may also change brew flow.

Espresso Uses Beverage Yield

For espresso, the ratio compares dry coffee with liquid espresso in the cup. A common starting recipe is 18 g coffee in and 36 g espresso out, or 1:2. The machine uses more water internally, but that is not the number used to describe the recipe.

Typical espresso ranges are approximately 1:1–1:1.5 for ristretto, 1:2 for espresso and 1:2.5–1:3 for a longer shot.

Why Grind Size Still Matters

Ratio controls strength, while grind size strongly affects how quickly water extracts flavour. If a brew has the right strength but tastes sour, try a slightly finer grind. If it tastes bitter, dry or hollow, try slightly coarser. Change one variable at a time so the result tells you something useful.

Why Water Temperature Matters

Water temperature changes how quickly coffee compounds dissolve. For most hot filter and immersion brews, start around 92-96°C. Light roasts often benefit from the hotter end of the range, while dark roasts may taste smoother with slightly cooler water.

Temperature does not replace ratio or grind adjustment. Set a repeatable dose and ratio first, then use the coffee brewing temperature guide when the coffee remains sour or harsh after a sensible grind change.

Recipes for Every Brewing Method

• Use a 1:2 beverage ratio in the Espresso recipe.
• Start at 60 g per litre with the Filter Coffee guide.
• Start around 1:16 in the V60 Pour Over recipe.
• Brew a full immersion with the Classic French Press recipe.
• Explore a more concentrated range in the AeroPress Daily recipe.
• Follow brewer capacity rather than a forced ratio in the Moka Pot Classic recipe.
• Compare ready-to-drink and concentrate ratios in the Cold Brew recipe.