Lena Savoie
Alcohol by volume (abbreviated as alc/vol or ABV) is a standard measure of the amount of alcohol in an alcoholic beverage. It is calculated as the volume of ethanol in the drink divided by the total volume of the solution, both measured at 20°C. The ABV is usually displayed on the label of alcoholic drinks and can be used to calculate the number of units in a drink. The number of units in a drink is dependent on the volume of the drink and its alcohol strength. Gas chromatography is considered the most accurate method for measuring alcohol content.
| Characteristics | Values |
|---|---|
| What is ABV? | ABV (Alcohol by Volume) is a measure of the amount of pure alcohol as a percentage of the total volume of liquid in a drink. |
| How is it calculated? | ABV is calculated as the volume of ethanol in the liquid if separated from the rest of the solution, divided by the volume of the solution, both at 20 °C (68 °F). |
| How to find the ABV of a drink? | The ABV is usually mentioned on the labels of cans and bottles, sometimes written as "vol" or "alcohol volume". You can also ask bar staff about a drink's ABV. |
| How to calculate units in a drink? | Multiply the total volume of a drink (in ml) by its ABV (measured as a percentage) and divide the result by 1,000. |
| How does ABV vary within beverage types? | ABV percentages can vary within a class of alcoholic beverages. For example, red wines tend to have higher ABV compared to white wines. |
| How is ABV measured? | Home brewers use a hydrometer or a refractometer to measure ABV. Large manufacturers use advanced techniques like distillation and gas chromatography. |
| Alcohol proof | In the US, alcohol proof is twice the ABV number. In the UK, it is 1.75 times the ABV. However, since 1980, the UK has replaced proof with ABV to avoid confusion with US standards. |
| Alcohol percentage and intoxication | The level of alcohol in a drink impacts the rate of intoxication. Low-alcohol drinks (<0.5%) are considered to be near impossible for a healthy person to become intoxicated from. |
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What You'll Learn
ABV (alcohol by volume)
Alcohol by volume (abbreviated as ABV or alc/vol) is a standard measure of the amount of alcohol in an alcoholic beverage. It is calculated by measuring the volume of ethanol in the drink, divided by the overall volume of the solution, both at 20 °C. Ethanol is lighter than water, with a density of 0.78945 g/mL. The ABV standard is used worldwide, with tables of density of water-ethanol mixtures at different concentrations and temperatures.
The ABV of a drink is used to calculate the number of alcohol units it contains. One unit equals 10ml or 8g of pure alcohol, which is roughly the amount processed by the body in an hour. This can vary depending on factors such as age, weight, metabolism, and food intake. To calculate the number of units in a drink, multiply the volume of the drink in millilitres by the ABV as a decimal, then divide the result by 1000. For example, a 750ml bottle of wine with 13.5% ABV contains 10 units.
The ABV of a drink can be estimated during the production process. Yeast is added to a sugary solution, which ferments the sugars and produces alcohol. The density of sugar in water is greater than the density of alcohol in water, so the change in specific gravity (SG) of the solution can be used to estimate the volume of alcohol. Brewers and winemakers use a variety of empirical formulae to estimate ABV.
The ABV of alcoholic drinks varies significantly. Beer typically has an ABV of around 5%, while craft beer can be closer to 9%. White wine usually averages 10% ABV, but can range from 5% to 14%. Red wine tends to have a higher ABV, ranging from 12% to 15%. Fortified wines, such as sherry, port, and madeira, are even stronger, typically ranging from 17% to 21% ABV. Distilled spirits, such as gin, whiskey, and vodka, have a much higher ABV, typically around 40%.
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Standard drinks
The concept of standard drinks was introduced to help people keep track of their drinking and understand how much alcohol they are consuming. Different alcoholic drinks contain varying amounts of alcohol, which can make it difficult to keep track of one's consumption. For instance, a pot of full-strength beer has 1.1 standard drinks, while an average glass of red wine (150ml) has 1.6 standard drinks.
In the United States, one standard drink contains about 14 grams or about 0.6 fluid ounces of pure alcohol. This is the amount of alcohol in a 12-ounce can of regular beer at 5% alcohol by volume. However, the same 12-ounce bottle at 10% alcohol by volume would contain two standard drinks. Thus, the percentage of pure alcohol or alcohol by volume (ABV) varies within and across beverage types.
Similarly, in Australia, a standard drink contains 10g of alcohol or 12.5ml of pure alcohol. The Australian drinking guidelines recommend no more than 4 standard drinks a day and no more than 10 standard drinks a week to reduce the risk of injury, accidents, and long-term health issues.
Standard drink sizes can help individuals count and track their drinks, which is important because excessive alcohol consumption can harm the liver and other organs. It is recommended that individuals have no more than 1 standard drink per hour to keep track of their blood alcohol concentration (BAC) levels and determine if they are fit to drive.
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Alcohol proof
The term "proof" is used to describe the alcohol content of a beverage. The use of the term "proof" to describe alcohol content has a long history, dating back to 16th-century England, when spirits were taxed based on their alcohol content. At that time, a basic "burn-or-no-burn" test was used to determine if a liquid was "above proof" or "under proof". If the liquid could be ignited, it was considered "above proof". The term "proof" was also used by British sailors around the same time, who would mix rum with gunpowder and try to ignite the mixture. If it ignited, it was considered proof of the alcohol content.
Over time, the definition of "proof" became more standardised. In 1816, a legal standard was established in England, defining 100 proof as a spirit with 12/13 the specific gravity of pure water at the same temperature. This was used as the basis for taxation. In 1848, the United States government established a standard for measuring alcohol content based on the percentage of alcohol, defining proof as twice the percentage of alcohol by volume (ABV). This is the system still used in the United States today, where a drink with 40% ABV is considered 80 proof, and most spirits are 80-proof or higher.
It is important to note that the definition of "proof" varies across different countries. While the United States defines 100 proof as 50% ABV, the UK previously used a different system, where 100 proof was equivalent to 70 proof in the US system. Today, the UK has adopted the ABV system, expressing the percentage of pure ethanol in a given volume of a beverage. Other countries may also have their own standards for measuring alcohol content.
The use of "proof" as a measure of alcohol content is now mostly historical, with liquor labels required to state their ABV rather than proof. However, understanding the proof of an alcoholic beverage is still important for consumers and regulators to gauge the strength of the beverage and for taxation purposes. Additionally, there are legal limits on the proof of alcoholic beverages that can be sold to the public, and different types of alcohol are subject to different regulations.
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Measuring alcohol content
Hydrometer
A common way to measure alcohol content is by using a hydrometer. A hydrometer is a scientific tool that measures the density of a liquid relative to water. The density of the liquid changes during fermentation as sugar gets converted into alcohol. To measure ABV, two measurements with the hydrometer are taken, one before fermentation and one after. By subtracting the first reading from the second, one can calculate the amount of alcohol in the drink.
Refractometer
A refractometer measures the sugar content of the liquid. It is a laboratory device that calculates the index of refraction from the observed refraction angle using Snell's law. The index of refraction can then be used to determine the ABV.
Laboratory Techniques
Larger manufacturers may use laboratories to analyse their beverages. Two common methods are distillation and gas chromatography. Distillation involves separating alcohol from the rest of the liquid by boiling and condensation. Gas chromatography is considered the most accurate method for measuring alcohol content. It involves separating and analysing compounds by turning the mixture into a gas. The gas then moves through a column containing a solid or thick liquid substance known as the "stationary phase". These separated components can then be detected and quantified.
Spirit Indication Test
The Spirit Indication Test is said to be the most accurate method available to most home mead-makers to calculate alcohol by volume. This involves boiling a known sample of the drink to remove all its alcohol, then reconstituting the solution to the original sample volume, and comparing the SG of the two samples to determine the ABV.
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Alcohol use recommendations
It is important to note that any amount of alcohol consumption can be associated with harm, and as the amount of alcohol consumed increases, so does the level of harm. Binge drinking, which is defined as consuming five or more drinks for males or four or more drinks for females on the same occasion, can lead to alcohol misuse and increase the risk of alcohol use disorder (AUD). AUD is characterised by an impaired ability to stop or control alcohol intake and can have adverse social, occupational, or health consequences.
To control alcohol intake, individuals can refer to the alcohol labels on cans and bottles, which indicate the ABV (alcohol by volume) or "vol". This indicates the percentage of pure alcohol in the total volume of the liquid. By multiplying the volume of the drink in milliliters by its ABV and dividing the result by 1,000, individuals can calculate the number of units of alcohol in their drink. For example, a 750ml bottle of wine with 13.5% ABV contains 10 units of alcohol.
Additionally, it is recommended that individuals who are pregnant, underage, have certain medical conditions, are taking medications that interact with alcohol, cannot control their alcohol intake, or are recovering from alcohol use disorder should refrain from drinking alcohol. Even low levels of alcohol consumption, such as less than one drink per day, can increase the risk of certain cancers. While some studies have suggested that moderate drinking may have health benefits, these findings are highly debated, and more recent studies show that there are no health benefits compared to abstaining from alcohol.
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Frequently asked questions
Alcohol percentage distribution per bottle is measured by alcohol by volume (ABV). This is the percentage of pure alcohol in the total volume of liquid in a drink. ABV can be measured by density with a hydrometer or sugar content with a refractometer.
The ABV of a drink is usually listed on the bottle or can. If it is not, you can search online for the beverage bottler or other reliable sources.
ABV varies within and across beverage types. For example, beer is generally between 3-7% ABV, wine is 9-14% ABV, and spirits start at 20% ABV but can be as high as 95% ABV.
