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Coffee Ratio Calculator — coffee-to-water ratio for every brew method

Great coffee starts with precision. The brew ratio — the proportion of coffee to water — is the single most important variable affecting strength, flavour, and aroma, regardless of the brewing method. Too little coffee yields a weak, watery brew; too much produces a bitter, astringent cup. The Specialty Coffee Association (SCA) golden standard for filter coffee is 60 g per litre of water (ratio 1:15.8). Espresso follows its own rule: 1:2 by weight (e.g. 18 g of coffee → 36 g of espresso). Each method has its own optimum — french press 1:15, pour over 1:16, cold brew concentrate 1:8, moka pot 1:7. The calculator supports 9 popular brew methods. You can enter the number of cups (it calculates coffee and water), grams of coffee (it calculates water), or millilitres of water (it calculates coffee). The result shows grams of coffee, millilitres of water, the ratio, and the number of servings. Enter your brew method and number of cups, or override with a specific coffee weight to calculate the exact water needed.

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How the coffee ratio calculator works

Each brew method is assigned a coffee:water ratio (e.g. filter 1:15.8, espresso 1:2). The calculator computes: 1. If you enter cups: water = cups × ml_per_serving (200 ml for drip/french press/pour over, 30 ml for espresso, 60 ml for moka), then coffee = water / water_factor. 2. If you enter coffee (g): water = coffee × water_factor. 3. If you enter water (ml): coffee = water / water_factor. Results are rounded to 0.1 g / 0.1 ml. The ratio is displayed as 1:X (e.g. 1:15.8 for SCA drip).

Example: filter coffee for 2 cups

Method: filter/drip, 2 cups × 200 ml = 400 ml water. SCA standard 1:15.8 → coffee = 400 / 15.8 ≈ 25.3 g. Espresso 1 shot (30 ml): coffee = 30 / 2 = 15 g. French press for 3 cups: 3 × 200 ml = 600 ml → 600 / 15 = 40 g coffee. Cold brew concentrate 500 ml → 500 / 8 = 62.5 g coffee (brew 18-24 h in the fridge).

Frequently asked questions about coffee ratios

What is the optimal coffee-to-water ratio?

The SCA (Specialty Coffee Association) standard for filter coffee is 1:15.8 (60 g of coffee per litre of water). For espresso the classic ratio is 1:2 by weight (e.g. 18 g of coffee → 36 g of espresso). Each brew method has its own recommended range.

How many grams of coffee per cup of filter coffee?

For a standard 200 ml cup at the SCA ratio of 1:15.8, you need about 12.7 g of coffee. For two cups (400 ml) that is about 25.3 g of ground coffee. Adjust to taste.

How much coffee for espresso?

A classic single espresso shot uses about 7-9 g of coffee for 30 ml of water (ratio 1:2 by weight: 18 g of coffee → 36 g of espresso). A double shot is about 18 g → 36 g. The calculator defaults to 30 ml per cup.

The recommended french press ratio is 1:15 (e.g. 60 g of coffee per 900 ml of water). For 3 standard cups (600 ml) you need 40 g of coarsely ground coffee. Brew time is typically 4 minutes.

Cold brew concentrate uses a 1:8 ratio (e.g. 125 g of coffee per litre of water, brewed 12-24 h in the fridge), then diluted 1:1 or 1:2 before serving. Ready-to-drink cold brew is brewed at 1:12.

The Specialty Coffee Association (SCA) defined the golden cup standard for filter coffee: 55-65 g of coffee per litre of water (the sweet spot is 60 g/L = ratio 1:15.8). The standard also specifies brew water temperature of 92-96 °C and extraction time of 4-6 minutes.

Pour over (e.g. V60, Chemex) involves manually pouring water over grounds in pulses, typically at a 1:16 ratio. Drip/filter uses an automatic machine at the SCA ratio of 1:15.8. Both methods use similar ratios but differ in technique and process control.

AeroPress is very versatile — typical ratios range from 1:13 to 1:15 (the calculator uses 1:14). A classic recipe calls for 15-18 g of coffee with 200-250 ml of water. Brew time is 1-3 minutes. Experimenting with ratios is key to finding your ideal cup.

A moka pot brews under pressure and uses a denser extraction — ratio approximately 1:7 (e.g. 20 g of coffee per 140 ml of water). Fill the basket to the top without tamping. The moka pot size (2, 4, 6 cups) is fixed — you cannot change the water volume.

One heaped tablespoon of coarsely ground coffee is about 7-8 g. One espresso scoop (barista measure) is about 7 g. For consistency and quality, a kitchen scale accurate to 1 g is recommended — a 2 g difference can noticeably change the taste of your coffee.

The ratios given are industry recommendations (SCA, SCAE, equipment manufacturers) and a starting point for experimentation. The optimal flavour depends on coffee variety, grind size, water hardness, and personal taste. The calculator does not replace tasting and fine-tuning.

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