tags: [] - coffee/brewing - coffee/measurement aliases: - Brix Scale - Degrees Brix - °Bx

Brix¶

Tags: #coffee/brewing #coffee/measurement Aliases: Brix Scale, Degrees Brix, °Bx Related: TDS (Total Dissolved Solids) | Extraction Yield | Refractometer | Brewing Control | Brewing Fundamentals MOC Status: ✅ Complete

Overview¶

Brix (symbol: °Bx) is a measurement scale indicating the concentration of dissolved solids in a liquid, expressed as a percentage by mass equivalent to sucrose in solution. Originally developed for measuring sugar content in grape juice and winemaking, Brix is applied in coffee across two distinct contexts: assessing cherry ripeness at origin, and approximating brewed coffee strength. In specialty coffee, TDS (Total Dissolved Solids) expressed as a percentage is the preferred measurement for brewed coffee, as it is measured with instruments calibrated specifically for coffee's compound composition.

Definition¶

One degree Brix (1°Bx) equals 1 gram of sucrose per 100 grams of solution — a 1% sucrose solution by mass. When applied to liquids that contain mixed dissolved compounds (such as brewed coffee or coffee cherry juice), Brix provides an approximation of total dissolved solids rather than a precise sucrose measurement, because the refractive index of mixed solutions differs from a pure sucrose solution.

Brix in Coffee Applications¶

Brewed Coffee Strength¶

A generic optical refractometer reports Brix, which closely approximates TDS percentage in brewed filter coffee. The SCA Gold Cup target range of 1.15–1.35% TDS corresponds approximately to 1.15–1.35°Bx.

Coffee-specific refractometers (VST, Atago) are calibrated for the compound profile of brewed coffee and report TDS directly. These provide greater accuracy than generic Brix instruments for specialty coffee measurement.

Brix reading	Filter coffee interpretation
Below 1.15°Bx	Weak; under-strength
1.15–1.35°Bx	SCA Gold Cup optimal range
1.35–1.50°Bx	Strong
Above 1.50°Bx	Very strong

Cherry Ripeness Assessment¶

Brix measurement of fresh cherry juice is used at origin to assess optimal harvest timing. A refractometer is used to measure a juice sample pressed from representative cherries.

Brix reading	Ripeness indication
Below 16°Bx	Under-ripe
18–22°Bx	Ripe; optimal harvest window
Above 22°Bx	Over-ripe; fermentation risk

Fermentation Monitoring¶

During wet processing, Brix of the fermentation liquid decreases as microorganisms consume the mucilage sugars. Tracking this decline indicates fermentation completion: typical mucilage Brix drops from approximately 18–22°Bx before fermentation to 12–16°Bx at endpoint.

Brix vs. TDS¶

Brix and TDS both use refractometry and are expressed as percentages. The key practical difference is calibration:

TDS (coffee refractometer): Calibrated for coffee's mixed compound profile; reports an accurate dissolved solids measurement
Brix (generic refractometer): Calibrated for sucrose; provides an approximation when applied to coffee or cherry juice

For brewed coffee measurement in specialty coffee contexts, coffee-specific TDS instruments are preferred. Brix is considered acceptable for cherry ripeness and fermentation monitoring at origin, where coffee-specific instruments are less commonly available.

Extraction Yield Calculation¶

TDS (or approximate Brix) can be used to calculate extraction yield:

Extraction Yield (%) = (Brewed Coffee TDS × Brewed Coffee Mass) ÷ Dry Coffee Mass

Example: 1.35% TDS × 300 g brewed coffee ÷ 20 g dry coffee = 20.25% extraction yield.

Key Facts¶

1°Bx = approximately 1% dissolved solids by mass in solution
SCA Gold Cup filter strength target (1.15–1.35% TDS) corresponds approximately to 1.15–1.35°Bx
Coffee-specific refractometers (VST, Atago) provide more accurate TDS readings than generic Brix instruments
Ripe coffee cherry juice typically measures 18–22°Bx; under-ripe below 16°Bx
Brix is preferred for cherry and fermentation assessment at origin; TDS for brewed coffee

TDS (Total Dissolved Solids)
Extraction Yield
Refractometer
Brewing Control
Brewing Fundamentals MOC

References¶

Changelog¶

Date	Change
2026-04-30	Compliance review: full rewrite — non-standard tags, bold title in prose, no metadata block, American English, USD equipment prices, prescriptive audience sections, missing required sections, no copyright

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