
Whisky is a strong alcoholic drink, and it's important to know how much you're consuming. A standard shot (25ml) of whisky, bottled at 40% ABV, contains one unit of alcohol. Whisky cocktails may contain more than one unit. Whisky is typically bottled at 40% ABV, but some are higher, going above 50% and even 60%, particularly in the case of whisky bottled straight from the barrel, or cask-strength whiskies. A 50ml shot of 40% whisky contains 20ml of ethanol, while a 55% whisky contains 27.5ml. One unit of alcohol is equal to 10ml or 8g of pure alcohol, which is the amount the average adult can process in an hour.
| Characteristics | Values |
|---|---|
| Number of units of alcohol in a standard shot (25ml) of whisky | 1 |
| Number of units of alcohol in a large (35ml) single measure of whisky | 1.4 |
| Number of units of alcohol in a 50ml shot of 40% whisky | 1.6 |
| Number of units of alcohol in a 50ml shot of 55% whisky | 2.2 |
| Number of units of alcohol in a 700ml bottle of 40% ABV whisky | 28 |
| Recommended maximum alcohol units per week | 14 |
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What You'll Learn
- Whisky ABV: Whisky's ABV is usually 40%, but some are higher, going above 50% or 60%
- Whisky units: Whisky cocktails often contain more than one unit. A 25ml shot of 40% whisky is one unit
- UK units: The UK introduced alcohol units in 1987 to help people monitor their drinking
- Alcohol units: One unit equals 10ml or 8g of alcohol, the amount processed in an hour by the average adult
- Health risks: Staying aware of units helps keep health risks low. Men and women should not exceed 14 units a week

Whisky ABV: Whisky's ABV is usually 40%, but some are higher, going above 50% or 60%
Whisky is a strong alcoholic drink, and its high strength means that it's important to be sensible about how much you consume. Whisky is typically bottled at 40% ABV, but this varies, with some whiskies going above 50% or even 60% ABV. The ABV of a drink is important because it determines how much alcohol is in a given drink and will impact the drinker.
Whisky must have a minimum alcohol content of 40% ABV, and most standard whiskies are diluted with water to a strength of 46% ABV after being decanted from the cask. This is done to make the whisky more palatable. Whisky cocktails are a great way to enjoy whisky in a more relaxed and flavourful manner, but it's important to remember that they can contain more than one unit of alcohol.
A standard shot (25ml) of whisky, assuming it is bottled at 40% ABV, contains one unit of alcohol. This means that a 700ml bottle of 40% ABV whisky contains around 28 units of alcohol. To calculate the number of units in a whisky, you need to know the drink's ABV and the volume of the measure being served. A simple formula to calculate the units in a drink is to multiply the volume by the ABV and move one decimal place to the left to get the units. For example, a 50ml shot of 40% whisky has 20ml of ethanol, and a 50ml shot of 55% whisky has 27.5ml of ethanol.
Whisky bottled straight from the barrel, or cask-strength whiskies, will have a higher ABV and contain more units of alcohol than whiskies with a lower ABV. For example, cask-strength whiskies are typically between 57% and 65% ABV. The proof point for whisky is around 57% ABV, and this is where the British adjusted their alcohol scale (57% = 100 proof). Whisky cannot be legally bottled at less than 40% ABV, and the maximum ABV for whisky is 62.5% ABV.
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Whisky units: Whisky cocktails often contain more than one unit. A 25ml shot of 40% whisky is one unit
Whisky cocktails are often free-poured by eye or served in larger measures than a standard 25ml single shot, so it can be challenging to know how much alcohol you're consuming. A standard 25ml shot of 40% ABV whisky is one unit of alcohol, but a 50ml shot of the same whisky is one and a half units. Whisky cocktails, therefore, often contain more than one unit of alcohol.
Whisky is a strong alcoholic drink, and legally, any whisky sold in the UK must be at least 40% ABV. This means 40% of the drink is pure alcohol, and if the ABV is higher, the percentage of alcohol is too. For example, half of a 50% ABV whisky is pure alcohol. Whisky cocktails made with whisky of a higher ABV than 40% will contain more units of alcohol than those made with a lower ABV whisky.
To calculate the number of units in a whisky, you need to know the drink's ABV and the volume of the measure being served. A formula to calculate the number of units in a whisky is to multiply the volume by the ABV as a decimal and move one decimal place to the left to get the units. For example, a 50ml shot of 40% whisky is 20ml of ethanol, which is 1.5 units.
It's important to be aware of how much alcohol you're consuming, as drinking more than 14 units of alcohol per week increases your risk of serious health conditions, including heart problems, high blood pressure, and poor mental health. Drinking alcohol also causes at least seven types of cancer, including breast, bowel, mouth, and throat cancers.
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UK units: The UK introduced alcohol units in 1987 to help people monitor their drinking
The UK introduced alcohol units in 1987 to help people monitor their drinking. An alcohol unit is a standardised measure of alcohol content, primarily used in the UK, to help individuals monitor their alcohol intake. One unit of alcohol is defined as containing 10 millilitres (ml) or 8 grams (g) of pure alcohol (ethanol). This measurement is used to provide a consistent way of understanding and comparing the alcohol content across different types of alcoholic drinks, which vary widely in strength and serving size.
The concept of alcohol units was introduced to simplify the tracking of alcohol consumption and to offer guidelines for safe drinking levels. For example, a single small shot of spirits (25 ml at 40% ABV), half a pint of average-strength beer (4% ABV), or a small glass of wine (125 ml at 12% ABV) each approximately equates to one unit of alcohol.
The number of units in a drink is based on the size of the drink, as well as its alcohol strength. A pint of strong lager contains 3 units of alcohol, whereas the same volume of lower-strength lager has just over 2 units. Whisky’s high strength means that it is important to be sensible about consumption. Most whisky is bottled at 40% ABV, but some are higher, going above 50% and even 60%, particularly in the case of whisky bottled straight from the barrel, or cask-strength whiskies. These whiskies will contain more units of alcohol than those with a lower ABV.
The UK Chief Medical Officers recommend that both men and women should not regularly consume more than 14 units of alcohol per week. This is a reduction from previous guidelines, which had recommended a limit of 21 units for men and 14 units for women.
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Alcohol units: One unit equals 10ml or 8g of alcohol, the amount processed in an hour by the average adult
Alcohol units are a way to measure and express the quantity of pure alcohol in a drink. One unit of alcohol is equivalent to 10 millilitres (10ml) or 8 grams (8g) of pure alcohol. This amount is also what an average adult's body can process within an hour. In other words, the liver can metabolise about one unit of alcohol per hour. After this time, there should, in theory, be little to no alcohol left in the bloodstream. However, this varies from person to person and depends on several factors, including the person, the drink, and the speed of consumption.
The concept of alcohol units was introduced in the UK in 1987 to help people monitor their alcohol intake. Units are particularly useful because alcoholic drinks come in different strengths and sizes. For example, a pint of strong lager may contain three units of alcohol, while the same volume of lower-strength lager may have just over two units. A single measure of typical spirits (25ml) is considered one unit of alcohol. Therefore, a 700ml bottle of 40% ABV whisky has around 28 units of alcohol.
To calculate the number of units in a drink, you need to know the drink's alcohol by volume (ABV) and the volume of the serving. Whisky, for instance, is typically bottled at 40% ABV, but some may be higher, reaching 50% or 60%, particularly those bottled straight from the barrel or cask-strength whiskies. A simple formula to calculate the units in a whisky is to multiply the volume by the ABV in decimal form and then move the decimal point one place to the left to get the units. For example, a 50ml shot of 40% whisky has 20ml of alcohol, while 55% whisky has 27.5ml of alcohol.
It is important to monitor alcohol intake and stay within the recommended guidelines. The UK's Chief Medical Officers advise that adults should not drink more than 14 units of alcohol per week, spread over at least three days. To process six units of alcohol, the average person's body would take six hours. Therefore, drinking more than the recommended amount in a shorter time can lead to intoxication, as the liver cannot speed up the detoxification process, and the unmetabolised alcohol continues to circulate in the bloodstream.
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Health risks: Staying aware of units helps keep health risks low. Men and women should not exceed 14 units a week
Alcohol consumption can have a serious impact on your health, so it's important to stay aware of how many units you're drinking. A standard shot (25ml) of whisky, typically containing 40% ABV, constitutes one unit of alcohol. Thus, a double whisky would contain two units of alcohol. The NHS recommends that men and women should not exceed 14 units of alcohol per week.
Excessive alcohol consumption can lead to several health issues. Firstly, it can cause disturbances in the body's organs and tissues, contributing to endocrine-related conditions such as thyroid diseases, abnormal cholesterol levels, reproductive dysfunction, stress intolerance, and diabetes. Alcohol can also increase the risk of developing type 2 diabetes due to its impact on weight, blood triglyceride levels, blood pressure, and insulin sensitivity. Additionally, drinking excessively can lead to "leaky gut," allowing toxins to enter the body and altering the gastrointestinal tract's microbiota.
The risk of certain cancers also increases with alcohol consumption. According to the National Cancer Institute, there is a strong consensus that alcohol drinking can cause various types of cancer. The more alcohol consumed, especially over an extended period, the higher the risk of developing an alcohol-associated cancer. Even moderate drinking can modestly increase this risk.
Alcohol consumption can also lead to high blood pressure, heart disease, liver disease, digestive problems, and a weaker immune system. It can negatively impact mental health, contributing to conditions like depression and anxiety. Additionally, memory problems, including dementia, and issues with learning and cognition may occur.
Excessive drinking can also lead to injuries, violence, alcohol poisoning, overdose, and an increased risk of sexually transmitted infections or unplanned pregnancies. It is important to drink responsibly and be aware of the number of units consumed to mitigate these health risks effectively.
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Frequently asked questions
A double whisky (50ml) with 40% ABV contains 2 units of alcohol.
The formula is quite simple: multiply the volume of alcohol in ml by its ABV (alcohol by volume) and divide the result by 1,000. For example, a 50ml shot of 40% ABV whisky is 0.40 x 50 = 20 / 1,000 = 0.02L or 2 units.
A unit of alcohol is a way of expressing the quantity of pure alcohol in a drink. One unit equals 10ml or 8g of pure alcohol, which is the amount of alcohol the average adult can process in an hour.
The NHS recommends that men and women drink no more than 14 units of alcohol per week.











































