The SG to ABV Calculator is used to convert specific gravity (SG) measurements into Alcohol By Volume (ABV). Specific gravity is the ratio of the density of a substance to the density of water. In brewing, the Original Gravity (OG) is measured before fermentation begins, and the Final Gravity (FG) is measured after fermentation is complete. The difference between these values indicates how much sugar has been converted into alcohol.
Using the SG to ABV Calculator, brewers can accurately determine the alcohol content of their beer, ensuring it meets their desired specifications.
Formula of SG to ABV Calculator
The formula for calculating ABV is:
where:
- OG is the Original Gravity, the specific gravity before fermentation.
- FG is the Final Gravity, the specific gravity after fermentation.
Calculation Steps
- Measure the Original Gravity (OG) before fermentation.
- Measure the Final Gravity (FG) after fermentation.
- Subtract the Final Gravity (FG) from the Original Gravity (OG).
- Multiply the result by 131.25 to get the ABV.
Conversion Table
Here is a table with common OG and FG values and their corresponding ABV:
| Original Gravity (OG) | Final Gravity (FG) | Alcohol By Volume (ABV) |
|---|---|---|
| 1.050 | 1.010 | 5.25% |
| 1.060 | 1.015 | 5.91% |
| 1.070 | 1.020 | 6.56% |
| 1.080 | 1.025 | 7.19% |
| 1.090 | 1.030 | 7.81% |
Example of SG to ABV Calculator
Let’s calculate the ABV for a beer with an Original Gravity (OG) of 1.065 and a Final Gravity (FG) of 1.010.
- Original Gravity (OG): 1.065
- Final Gravity (FG): 1.010
- Subtract FG from OG: 1.065−1.010=0.055
- Multiply the result by 131.25: 0.055×131.25=7.22
So, the ABV of the beer is 7.22%.
Most Common FAQs
The SG to ABV Calculator is quite accurate for most homebrewing purposes. However, it may not account for all variables in fermentation, such as temperature changes and yeast efficiency. For precise commercial brewing, more advance methods might be require.
OG stands for Original Gravity, which is the specific gravity of the wort before fermentation. FG stands for Final Gravity, which is the specific gravity of the beer after fermentation. These measurements are crucial for determining the alcohol content of the beer.
Yes, the SG to ABV Calculator can be use for any type of beer. It is a universal tool for brewers to estimate the alcohol content based on specific gravity readings.