tags: [] - coffee/brewing - coffee/education aliases: - Brew ratios - Coffee to water ratio - Coffee brewing ratios

Coffee Ratios¶

Tags: #coffee/brewing #coffee/education Aliases: Brew ratios, Coffee to water ratio, Coffee brewing ratios Related: Brew Ratio | Extraction Yield | Brewing Fundamentals MOC | ../Maps of Content/Grind Size MOC | Contact Time Status: ✅ Complete

Overview¶

Coffee ratios refer to the proportion of ground coffee to brewing water, expressed by mass (grams) as a ratio of coffee to water — for example, 1:15 means one gram of coffee to 15 grams of water. Ratio is one of the four primary extraction variables alongside grind size, water temperature, and contact time. Different brewing methods use different standard ratios because each method extracts at a different efficiency; understanding ratios allows consistent, repeatable results across any brewing context.

How Ratios Work¶

A coffee ratio is always expressed as coffee : water by mass:

1:15 — 1 g coffee to 15 g water (stronger)
1:16 — 1 g coffee to 16 g water (SCA filter reference point)
1:17 — 1 g coffee to 17 g water (lighter filter)

The number following the colon represents how many grams of water per gram of coffee. Higher numbers produce weaker coffee (more water per gram of coffee); lower numbers produce stronger coffee.

[!IMPORTANT] Ratios must be measured by mass (grams), not by volume (tablespoons, cups). Volume measurement introduces significant variability because coffee density varies with grind size, roast level, and freshness.

Standard Ratios by Method¶

Method	Typical ratio	Notes
Espresso (traditional)	1:2	18 g in → 36 g out; range 1:1.5–1:3
Espresso (lungo)	1:3–1:4	Longer yield; less concentrated
Ristretto	1:1–1:1.5	Very short yield; concentrated
Pour over (V60, Chemex)	1:15–1:17	SCA reference: 1:16
French press	1:12–1:15	Higher ratio compensates for immersion efficiency
AeroPress	1:6–1:16	Highly variable; recipe-dependent
Moka pot	1:7–1:10	Fill basket to rim; water level is fixed by device
Batch brew	1:15–1:17	SCA-certified machines target 1:16 at correct dose
Cold brew (concentrate)	1:4–1:8	Concentrate; dilute 1:1 to 1:2 before serving
Cold brew (ready to drink)	1:10–1:15	Brewed at consumption strength
Turkish coffee	1:10–1:12	Measured by volume traditionally; high extraction method
Cupping (SCA)	1:18.18	8.25 g per 150 ml; SCA cupping standard

SCA Brewing Standards¶

The SCA (Specialty Coffee Association) defines the Gold Cup Standard for filter coffee:

Ratio: 55–65 g of coffee per litre of water (approximately 1:15–1:18)
TDS target: 1.15–1.45% (Total Dissolved Solids)
Extraction yield target: 18–22%

The most widely cited reference point within this range is 60 g/L (1:16.7), often rounded to 1:16 for simplicity. See Extraction Yield for detail on TDS and extraction percentage.

Adjusting Ratio for Taste¶

Ratio adjusts strength independently of extraction character when held constant against other variables:

If the cup is...	Adjustment
Too weak / thin	Use less water (lower the ratio number) or increase dose
Too strong / intense	Use more water (raise the ratio number) or reduce dose
Bitter despite correct strength	Adjust grind size or temperature, not ratio
Sour despite correct strength	Adjust grind size or contact time, not ratio

Ratio controls strength (concentration); grind size and contact time control extraction character (flavour). Conflating the two leads to incorrect adjustments — a thin, sour cup is usually an extraction problem (under-extracted), not a ratio problem.

Espresso Ratio in Practice¶

Espresso ratio is expressed as dose in to yield out:

Dose: the mass of dry ground coffee loaded into the portafilter (typically 15–21 g)
Yield: the mass of liquid espresso in the cup (typically 30–45 g)
Ratio: yield ÷ dose; a 18 g dose producing 36 g yield = 1:2

Changing espresso ratio changes flavour character significantly at espresso concentrations. A 1:1.5 ristretto and a 1:3 lungo from the same dose and grind will taste very different — not just stronger or weaker. See Brew Ratio for a complete treatment.

Key Facts¶

Coffee ratios are always expressed by mass (coffee : water); volume measurement is unreliable
SCA filter reference ratio: 60 g/L, or approximately 1:16–1:17
Espresso standard ratio: 1:2 (18 g in / 36 g out); range 1:1.5–1:3
Ratio controls strength; grind size and contact time control extraction character — these are independent variables
French press and immersion methods typically use slightly higher ratios (less water) because immersion is less efficient at extraction than percolation
Cold brew concentrate uses very low ratios (1:4–1:8) and is diluted before serving

References¶

Changelog¶

Date	Change
2026-04-28	Note created

This article is part of All-About-Coffee.com - The comprehensive coffee knowledgebase.