Brix to Specific Gravity
Standard winemaking conversion. Accurate for a sugar solution before fermentation.
Bx
Specific gravity
1.0830
SG = 1 + ( Brix / ( 258.6 - ( ( Brix / 258.2 ) x 227.1 ) ) )
About this conversion
Brix measures dissolved sugar as a percentage by weight. Specific gravity measures density against water. The formula above is the standard polynomial relation used across brewing and winemaking, accurate for a sugar solution before any alcohol forms.
If you are reading Brix on a refractometer after fermentation has started, the alcohol present will skew the result. In that case use the refractometer tool, which applies the alcohol correction before reporting SG and ABV.
Brix to SG reference table
| Brix | Specific gravity |
|---|---|
| 2 | 1.0078 |
| 4 | 1.0157 |
| 6 | 1.0237 |
| 8 | 1.0318 |
| 10 | 1.0400 |
| 12 | 1.0484 |
| 14 | 1.0568 |
| 16 | 1.0654 |
| 18 | 1.0741 |
| 20 | 1.0830 |
| 22 | 1.0920 |
| 24 | 1.1011 |
| 26 | 1.1103 |
| 28 | 1.1197 |
| 30 | 1.1292 |
Read Brix in seconds: a few drops on a refractometer gives a Brix reading you can convert here. Faster than a hydrometer and it needs almost no sample.
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Common questions
How do you convert Brix to specific gravity?
Use SG = 1 + (Brix / (258.6 - ((Brix / 258.2) x 227.1))). For example 20 Brix works out to about 1.0829 SG.
Is a refractometer Brix reading accurate after fermentation starts?
No. Once alcohol is present a refractometer over reads, so the raw Brix needs an alcohol correction. Before fermentation the conversion above is accurate.
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