Noah Vinter
Alcohol by volume (ABV) is the standard measure of the amount of alcohol in a drink. ABV is calculated as a percentage of the total volume of the drink. For example, a drink with 5% ABV means 5% of the total volume of the drink is alcohol. ABV can be calculated by measuring the density of the alcoholic liquid before and after fermentation, as the density changes when sugar is converted into alcohol. Alternatively, ABV can be calculated by multiplying the volume of alcohol by the ABV percentage and then dividing that number by the total volume of the drink. Finally, there are also electronic alcohol meters that can test the ABV of a drink.
| Characteristics | Values |
|---|---|
| How to calculate ABV | Determine volume of alcohol, total volume of drink, divide volume of alcohol by total volume, multiply by 100 |
| ABV definition | Alcohol by Volume, standard measure of amount of alcohol present in a drink |
| ABV calculation | Volume of alcohol/total volume x 100 |
| ABV of cocktails | Calculate ABV of each ingredient, add pure alcohol figures, divide by total drink volume, multiply by 100 |
| ABV of beer | ABV x volume of beer in ounces = volume of alcohol in ounces |
| ABV of wine | ABV x volume of wine in ounces = volume of alcohol in ounces |
| ABV of spirits | ABV x volume of spirit in ounces = volume of alcohol in ounces |
| ABV of US vodka | 80 proof = 40% ABV |
| ABV of US spirits | Typically range from 40-50% |
| ABV of liqueurs | Typically lower than spirits |
| ABV of martinis | Typically 35-39% |
| ABV of other cocktails | Typically 25-35% |
| ABV calculation tools | Hydrometer, refractometer, electronic alcohol meters |
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What You'll Learn
Check the label
When it comes to liquor, beer, and wine, the most straightforward way to determine the percentage of alcohol in the beverage is to check the label. Alcohol by volume (ABV) is a standard measure of the amount of alcohol present in a drink, and it is calculated as a percentage of the total volume of the drink. ABV is required on every alcoholic beverage sold on the legal market worldwide, including all liquor, wine, and beer.
On a liquor bottle, you will typically see two numbers indicating the strength of the distilled spirit: alcohol by volume and proof. Alcohol by volume may be written as "alc/vol" or "ABV" on the label. It is given as a percentage and measures the amount of alcohol in a bottle compared to the total volume of liquid. For example, if a drink has an ABV of 5%, that means 5% of the total volume of the drink is alcohol. The US standard drink (or drink equivalent) size contains 14 grams of pure alcohol, according to the Centers for Disease Control and Prevention.
Proof is a number primarily used in the United States to denote the taxes a distiller needs to pay on a certain amount of liquor. It is generally twice the percentage of alcohol listed. For example, spirits with an ABV of 40% are considered 80 proof. Brandy, gin, rum, tequila, vodka, and whiskey are typically 40% ABV or 80 proof. Some high-proof liquors, primarily whiskeys and rums, reach over 50% ABV (100 proof). Liqueurs tend to range from 15% to 30% ABV (30 to 60 proof). Beer typically ranges from 3% to 13% ABV, though most fall somewhere between 4% and 7%. Wine alcohol content ranges between 9% and 14% ABV, unless it is fortified, in which case it may have an ABV of 16-24%.
It is important to note that different kinds of drinks may contain the same amount of alcohol but have very different ABVs because of their serving sizes. For example, 1.5 oz of a spirit, 5 oz of wine, and 12 oz of beer are all considered one standard drink in the US because they contain around the same amount of alcohol.
If you are mixing drinks, it can be challenging to determine the exact ABV of the cocktail. The biggest unknown in the formula is how the drink is mixed, as every bartender mixes drinks slightly differently. Some shake harder, causing more ice to dilute the drink, and some use different amounts of alcohol or mixers. However, a simple formula can help you estimate the alcohol content of your mixed drinks. First, multiply the volume of each alcoholic ingredient by its ABV percentage to find out how much alcohol is in each. Then, add up the alcoholic ingredients, and take that number as a percentage of the total volume of the drink. This will give you an estimated ABV for your cocktail.
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Use a hydrometer
A hydrometer is a tool used for measuring the density of a liquid, also known as its specific gravity. This measurement indicates the ratio between the weight of the liquid and that of an equal volume of water. Alcohol has a different density than the sugar/water mixture from which it is made, so you can calculate the percentage of alcohol in a solution by measuring the initial specific gravity and the final specific gravity.
To use a hydrometer, start by sanitising all your equipment, including the hydrometer, the hydrometer tube, and whatever you'll be drawing your sample with. Wash your hands before continuing. Place the freshly sanitised hydrometer in its tube. Using your sampler, draw off a small sample of your brew from the middle and place it in the tube. Carefully drop the hydrometer into the liquid and spin it to remove any bubbles that may be skewing the reading. From eye level, read the hydrometer's measurement from the bottom of the meniscus (the curved surface caused by surface tension). Note down your reading and the date the measurement was taken.
You can then return the sample to the larger brew, assuming all the equipment was properly handled and sanitised. If you are taking a reading from a beer, wine, or cider brew, the hydrometer measures the amount of dissolved brewing sugar in the recipe. If you notice the amount of sugar going down, fermentation is working, and alcohol is increasing.
To calculate the percentage of alcohol by volume (ABV), you need both the original gravity and final gravity readings. Subtract the final gravity from the original gravity and multiply the result by 131.25. This will give you the percentage of alcohol by volume. For example, if your initial gravity was 1.108, and your final gravity was 1.041, your beer is approximately 8.79% alcohol by volume.
It's important to note that this method provides an approximation that loses accuracy as the alcohol content increases. Other factors, such as temperature, the amount of alcohol produced, and other ingredients used, will also affect the accuracy of the ABV.
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Use a refractometer
A refractometer is a device that measures the concentration of a variety of substances dissolved in water by measuring how light is refracted, or bent, as it passes through the liquid. In an alcoholic beverage, the amount of sugar and alcohol affects how light refracts in the liquid.
To use a refractometer, first calibrate the unit by placing a few drops of distilled water onto the slide and setting the scale to zero. Next, place a few drops of the liquor onto the slide, ensuring there are no bubbles, and hold it up to a light source. A natural light source is best. Then, look through the eyepiece to get the reading. No need for a lookup table—just make sure the liquid is at room temperature (between 0 and 25 degrees Celsius).
Refractometers are commonly used to measure the starting sugar concentration before fermentation and less so afterward because they require more extensive corrections compared to hydrometer measurements and are less precise at this point. They are also inaccurate for anything containing less than 10% alcohol.
There are also calculators and spreadsheets available to determine alcohol content from a refractometer reading. For example, if a droplet of whisky or gin measures 1.000 on the refractometer, then it contains approximately twelve units of alcohol. Conversely, if a fruit-based sample reads 0.890 in Brix (Bx) measure, then it contains approximately 8% alcohol by volume (ABV).
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Calculate ABV
ABV stands for Alcohol By Volume and is a measurement of the alcohol contained in any given bottle of spirit. ABV is calculated as a percentage of the total volume of the drink. For example, a drink with 5% ABV means 5% of the total volume of the drink is alcohol.
There are a few ways to calculate ABV. One way is to use a hydrometer to measure the density of the liquid before and after fermentation. During fermentation, the density of the alcoholic liquid changes as sugar gets converted into alcohol. A hydrometer will sink more after fermentation because the sugars have been converted to alcohol. To measure ABV, you make two measurements with the hydrometer, one before fermentation and one after. By subtracting the first reading from the second and then making a simple calculation, you can find the ABV.
Another way to calculate ABV is by using a simple formula. First, determine the volume of alcohol in the drink. Next, determine the total volume of the drink. Then, divide the volume of alcohol by the total volume of the drink. Finally, multiply the result by 100 to get the ABV percentage.
For example, let's say you want to add a standard shot of 1.5 oz of 40% ABV vodka to a tall glass of soda water. First, multiply 1.5 oz by the ABV percentage, which is 0.4 in this case, to find the volume of alcohol in the shot, which is 0.6 oz. Next, add the volume of alcohol to the volume of soda water, which is 10 oz in total. Then, divide 0.6 oz by 10 oz, which equals 0.06. Finally, multiply by 100 to get the ABV percentage, which is 6%.
There are also free ABV calculators available online that can help with these calculations. Additionally, there are electronic alcohol meters that can test your drinks and tell you the ABV, but these can be quite expensive.
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Use an electronic alcohol meter
An alcohol meter is a tool used to measure the alcohol content in various beverages. It is an essential device for anyone involved in home alcohol production. It works by measuring the density of a liquid—as the density decreases, the alcohol content increases.
Prepare the sample:
Use a graduated cylinder or a tall glass and pour in the alcohol sample. Ensure the container is clean and dry. The ideal temperature for measurements is 20°C (68°F). Higher temperatures can distort the results.
Immerse the alcohol meter:
Gently place the alcohol meter into the sample, ensuring it does not touch the bottom or sides of the container. It should float freely in the centre of the liquid. If it rests against the side, move it back towards the centre. Hold the alcohol meter by the end as you lower it to prevent oils or dirt from your fingers from affecting the reading.
Remove any bubbles:
Spin the top section of the alcohol meter a few times to remove any excess bubbles. The alcohol meter needs to be free of any bubbles to accurately read the alcohol content.
Take the reading:
Look at the bottom of the meniscus (the arc in the liquid against the alcohol meter) on the alcohol meter. The number at the meniscus will tell you the proof of the alcohol, which corresponds to a percentage of alcohol content. For example, if the number at the bottom of the meniscus is "97", then the alcohol content is 97%.
Important considerations:
- Always use a glass test jar instead of a plastic one when measuring high-proof samples, as high concentrations of alcohol can cause plastic to disintegrate.
- Alcohol meters work best for measuring pure alcohol solutions such as vodka, spirits, or moonshine. They are not suitable for measuring alcohol in beverages containing sugar, like wines or liqueurs, as sugar distorts the accuracy of the measurement.
- Always test your alcohol percentage when the spirit is in raw form prior to adding any additives.
- Ensure your alcohol meter is calibrated for measuring alcohol content.
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Frequently asked questions
To calculate the percentage of alcohol in a cocktail, you need to multiply the volume of each alcoholic ingredient by its alcohol content, then add the results together. For example, if you mix 1.5 oz of 50% vodka with 1.5 oz of 20% liqueur, you would do the following calculation: 1.5 x 0.5 + 1.5 x 0.2 = 0.75 + 0.3 = 1.05 oz of alcohol. Then, take the volume of alcohol as a percentage of the total volume of the drink. For example, if the total volume of the drink is 450ml, you would do the following calculation: (1.05 / 450) x 100 = 0.23 x 100 = 23%. Therefore, the cocktail has an alcohol content of 23%.
If you don't know the volume of alcohol in your drink, you can use a hydrometer to measure the density of the liquid before and after fermentation. The difference between the two readings will indicate how much sugar has been converted into alcohol. Manufacturers of hydrometers provide formulas and charts to help you convert these readings into an accurate alcohol by volume (ABV) result. Alternatively, you can use a refractometer to measure the concentration of substances dissolved in a liquid, or an electronic alcohol meter.
In the US, a standard drink contains about 14 grams or 0.6 fluid ounces of pure alcohol. This is equivalent to 1.5 ounces of liquor or distilled spirits (80-proof liquor), 12 ounces of beer, 5 ounces of wine, or 0.6 ounces of alcohol diluted with 7.5 ounces of soda water.
