Specific Gravity to Brix
Standard conversion. Accurate for a sugar solution before fermentation.
SG
Brix
9.99Bx
Brix = 182.4601 x SG³ - 775.6821 x SG² + 1262.7794 x SG - 669.5622
About this conversion
Specific gravity measures density against water. Brix expresses the same dissolved sugar as a percentage by weight. The cubic formula above is the accepted relation used in brewing and winemaking and holds for a sugar solution before fermentation.
After fermentation begins the dissolved solids are no longer pure sugar, so a converted Brix figure becomes an approximation. For tracking attenuation, stay on one scale across the whole batch.
SG to Brix reference table
| Specific gravity | Brix |
|---|---|
| 1.010 | 2.56 |
| 1.020 | 5.08 |
| 1.030 | 7.56 |
| 1.040 | 9.99 |
| 1.050 | 12.39 |
| 1.060 | 14.74 |
| 1.070 | 17.05 |
| 1.080 | 19.33 |
| 1.090 | 21.57 |
| 1.100 | 23.77 |
| 1.110 | 25.94 |
| 1.120 | 28.08 |
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 specific gravity to Brix?
Use Brix = 182.4601 x SG cubed minus 775.6821 x SG squared plus 1262.7794 x SG minus 669.5622. For example 1.040 SG is about 9.99 Brix.
Why convert SG to Brix at all?
Many recipes and refractometers report in Brix while hydrometers read SG. Converting lets you compare readings from different instruments on the same scale.
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