Specific gravity to potential alcohol
Type a value in SG to get it in % pot. instantly.
7.308% pot.
That's 1.03× as sweet as fruit juice, while strong beer wort is 1.45× sweeter. Fermented dry, that would give roughly 7.308% ABV.
What it means
How sweet is that?
Refractometer readings drift once fermentation starts, because alcohol bends light differently. Hydrometers stay honest.
The math
How to convert SG to % pot.
Brix and specific gravity relate through a cubic fit: SG ≈ 1 + °Bx ÷ (258.6 − °Bx × 0.88). Potential alcohol is roughly °Bx × 0.59.
Example: 1.05 SG = 7.30835 % pot..
Every unit
Your reading in every unit
Tables
SG to % pot. conversion table
| SG | % pot. |
|---|---|
| 1.01 SG | 1.5107 % pot. |
| 1.02 SG | 2.99794 % pot. |
| 1.03 SG | 4.45953 % pot. |
| 1.04 SG | 5.89611 % pot. |
| 1.05 SG | 7.30835 % pot. |
| 1.06 SG | 8.69687 % pot. |
| 1.07 SG | 10.0623 % pot. |
| 1.08 SG | 11.4054 % pot. |
| 1.09 SG | 12.7266 % pot. |
| 1.11 SG | 15.3064 % pot. |
| 1.13 SG | 17.8069 % pot. |
% pot. to SG conversion table
| % pot. | SG |
|---|---|
| 2 % pot. | 1.01326 SG |
| 4 % pot. | 1.02684 SG |
| 6 % pot. | 1.04073 SG |
| 8 % pot. | 1.05497 SG |
| 10 % pot. | 1.06955 SG |
| 12 % pot. | 1.0845 SG |
| 14 % pot. | 1.09981 SG |
| 16 % pot. | 1.11552 SG |
| 18 % pot. | 1.13163 SG |
| 20 % pot. | 1.14817 SG |
| 22 % pot. | 1.16514 SG |
| 25 % pot. | 1.19145 SG |
| 30 % pot. | 1.23774 SG |
Quick answers
Quick answers
- How many % pot. is 1 SG?
- 1 SG is 0 % pot..
- How many % pot. is 1.05 SG?
- 1.05 SG is 7.30835 % pot..
The units
About these units
Specific gravity (SG)
Density compared with water. Fresh wort might read 1.048.
Potential alcohol (% pot.)
How strong it would be if every gram of sugar fermented away.
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