How Many Units Are in a Bottle of Vodka?

A standard 700 ml bottle of vodka at 40% ABV contains 28 units of alcohol. That number shifts depending on the bottle size and the vodka’s strength, and many popular brands sit above the legal minimum ABV, which means the actual count can be higher than people assume. The unit system itself is specific to the UK, so if you are comparing across countries, the math changes in ways worth understanding.

The Simple Calculation

The formula for working out how many units are in any alcoholic drink is straightforward: multiply the volume of the drink in millilitres by its ABV (expressed as a percentage), then divide by 1,000. For a 700 ml bottle of vodka at 40% ABV, that gives you 700 × 40 ÷ 1,000 = 28 units.¹ One UK unit equals 10 ml of pure alcohol, which weighs 8 grams.² So when you see “28 units,” you are looking at 280 ml of pure ethanol in that bottle, or about 224 grams.

A single pub measure of vodka in the UK is 25 ml, which at typical strength works out to one unit. A double is 50 ml and two units. That means a 700 ml bottle holds the equivalent of 28 single measures or 14 doubles.¹ Knowing the formula lets you adjust for any bottle you encounter, rather than memorising fixed numbers that only apply to one size.

Common Bottle Sizes and Their Unit Counts

Not every vodka bottle is 700 ml. Here is how the units stack up across the sizes you are most likely to find, all calculated at 40% ABV:

200 ml (hip flask size): 8 units
350 ml (half bottle): 14 units
700 ml (standard UK bottle): 28 units
750 ml (standard US bottle): 30 units
1 litre: 40 units
1.5 litres (magnum): 60 units

The 750 ml format is worth flagging because it is the default in the United States, Australia, and several other markets. If you buy vodka while travelling or order from an international retailer, that extra 50 ml adds two more units compared to the UK standard bottle. It sounds trivial, but across a week of drinking it can amount to a meaningful difference in total intake.

When ABV Pushes the Count Higher

For a spirit to be legally sold as vodka in the UK, it must be at least 37.5% ABV. Many widely bought brands, however, sit at 40%, and some go well above that. A bottle at 37.5% contains 26.25 units rather than 28, while a craft or export-strength vodka at 50% ABV bumps the same 700 ml bottle up to 35 units.³ That is a difference of nearly nine units between the lightest and a moderately strong vodka, all from the same bottle size.

Polish and Scandinavian export vodkas often land between 40% and 45%, while some overproof varieties reach 50% or higher. If you are used to drinking a brand at 37.5% and switch to one at 50% without adjusting how much you pour, you are getting about a third more alcohol per glass. Checking the label takes a few seconds and can genuinely change how you pace yourself over an evening.

Units Versus Standard Drinks Around the World

The UK unit (8 g of ethanol) is smaller than the “standard drink” used in most other countries. Across 37 countries surveyed, standard drink definitions ranged from 8 to 20 grams of pure ethanol, with 10 grams being the most common.⁴ In the United States, a standard drink is 14 grams, nearly double the UK unit. In Australia it is 10 grams, and in Japan it is 19.75 grams.

This variation makes international comparisons genuinely confusing. A US study reporting that someone consumed “four drinks” is describing roughly 56 grams of ethanol, which is seven UK units. If you read health advice from an American source and mentally translate “drinks” into “units,” you will dramatically undercount the alcohol involved.⁵ A 750 ml bottle of 40% vodka contains about 17 US standard drinks but 30 UK units. Same bottle, same liquid, very different-sounding numbers.

How a Bottle Compares to Weekly Guidelines

Current UK guidance from the Chief Medical Officers recommends that both men and women drink no more than 14 units per week, spread over several days. That is exactly half of a standard 700 ml bottle at 40% ABV. Older guidelines, first proposed by the Royal College of Physicians, set the threshold at 21 units per week for men and 14 for women.² The 2016 revision brought men’s limit down to match women’s at 14, reflecting updated evidence on long-term health risks.

Framing it as a bottle makes the guideline concrete: if you are drinking only vodka, 14 units a week means roughly half a standard bottle. A full bottle in a week is double the recommended limit. Two people sharing a bottle over a weekend are already near the weekly cap each, assuming they split it evenly. These comparisons are rough, but they are the kind of quick mental check that is hard to do if you are thinking in individual measures and losing count.

Why People Get the Count Wrong at Home

In a pub, spirit measures are controlled by optics or jiggers. At home, most people free-pour, and the research on how accurately they do it is not flattering. A study that asked people in England to pour their “usual glass” of spirits found that the average pour contained about 1.9 units, nearly double the standard single measure.⁶ That means what most people think of as “one drink” is closer to two units.

When asked to estimate how many units they had just poured, about 42% of spirit pours were overestimated and 17% were underestimated. At first glance that sounds reassuring, as though people are being cautious. But overestimation here means people thought they poured more than they actually did, which means they believed their glass contained more alcohol than it really held. The remaining group who underestimated, about one in six, thought they had poured less than they really had. Either way, the disconnect between what people think they are drinking and what is actually in the glass is large enough that counting drinks by the glass is unreliable without a measuring tool.⁶

US research tells a similar story from a different angle. When people poured their own spirits drinks in a study setting, the weighted average alcohol content per pour was 0.89 ounces of pure alcohol, well above what a US standard drink assumes, and spirits pours were particularly variable, with many high-alcohol outliers.⁷ If you rely on the “a drink is a drink” assumption, spirits will quietly deliver more alcohol than you plan for.

What Mixers Do to How Fast You Feel It

The total units in a bottle do not change when you add a mixer, but how quickly your body absorbs those units does. Carbonated mixers speed things up for most people. In one controlled experiment, two-thirds of participants absorbed alcohol faster when it was mixed with a carbonated drink compared to a still one, and the difference in absorption rate was statistically significant.⁸ The carbonation appears to accelerate gastric emptying, pushing alcohol into the small intestine, where absorption is faster.

Diet mixers add another wrinkle. When vodka was mixed with a diet soft drink instead of a sugar-sweetened one, the stomach emptied faster and both peak blood alcohol concentration and total alcohol exposure over three hours were significantly higher.⁹ More recent work has confirmed the same pattern using breath alcohol measurements: diet cola produced a higher peak and greater overall alcohol exposure than regular cola.¹⁰ The sugar in regular mixers seems to slow the stomach’s emptying, acting as a brake on absorption. Without that sugar, the alcohol hits your bloodstream sooner and at a higher peak.

This does not mean diet mixers are “more dangerous” in some dramatic way, but it does mean the same number of units can produce noticeably different levels of intoxication depending on what you mix them with. If you have switched from sugary tonic to a diet version and noticed that you feel drinks more quickly, the physiology backs up that observation.

How Blood Alcohol Levels Map to Those Units

Knowing a bottle contains 28 units is abstract. What those units actually do to your body depends on how fast you drink them, your weight, your sex, and whether you have eaten. As a rough guide, after consuming one to two units (roughly 16 grams of ethanol), most people feel more talkative and less inhibited. By the time blood alcohol concentration reaches around 80 mg per 100 ml of blood, cognitive and motor functions are measurably impaired. At 150 mg per 100 ml, signs of intoxication become obvious: slurred speech, poor coordination, confusion. At 300 to 400 mg per 100 ml, most people are unconscious with dangerously slowed breathing.¹¹

For an average-weight man drinking on an empty stomach, it takes roughly ten to twelve units consumed within a few hours to reach the severely dangerous range. For a lighter person or a woman (who generally has a higher blood alcohol response per unit due to differences in body water composition), less is required. The entire contents of a standard bottle consumed over a short period would be life-threatening for most people. That sounds extreme, and it is, but fatal alcohol poisoning does happen, and the gap between “very drunk” and “in danger” is smaller than many people think.

Binge Drinking Thresholds in Context

Binge drinking is commonly defined as consuming more than six units in a single session, alongside related markers like how fast you drink and how often you get drunk.¹² Six units of vodka at 40% is 150 ml of liquid, a little over a fifth of a standard bottle. If you are free-pouring doubles (roughly 50 ml each) into three mixed drinks over the course of an evening, you have already crossed the six-unit binge threshold. The ease of reaching it with spirits is one of the reasons public health guidance singles out spirit-heavy drinking patterns as a concern.

Research looking at different drink types and health outcomes has found that spirit consumption is associated with an increased risk of death from all causes and of cardiovascular events, independent of total alcohol volume.¹³ Whether this reflects the drinks themselves or the drinking patterns that go with spirits is still debated. Spirits make it easy to consume a lot of alcohol quickly in a small volume of liquid, and that pattern of concentrated intake is harder to achieve with beer or wine. Whatever the underlying cause, the association is consistent enough to be worth knowing about.

Label Information and What Is Often Missing

You might assume that a vodka bottle would clearly state how many units it contains. In the UK, there is no legal requirement to display unit information on alcohol labels. Instead, the industry operates under a voluntary agreement. When researchers assessed whether the alcohol industry had met its own pledge to ensure that 80% of products carried clear health labelling, they found that only about 57% met best-practice standards.¹⁴ Many bottles carry the ABV and volume, which gives you the raw inputs for the calculation, but do not spell out the total unit count or the number of units per serving.

This is one area where consumer convenience and public health messaging diverge. A calorie count on a food packet is mandatory and immediately useful. The equivalent information on a bottle of vodka, how many units it contains and how that relates to weekly guidelines, remains optional and inconsistently presented. If you want to know how many units you are buying, the formula is your most reliable tool.

How Minimum Unit Pricing Changes the Equation

Scotland introduced a minimum unit price of 50 pence per unit in 2018, and Wales followed in 2020. The policy sets a floor price based on units rather than volume, which hits the cheapest high-strength products hardest. A 700 ml bottle of 40% vodka (28 units) cannot legally be sold for less than £14 in Scotland. Before the policy, some supermarket vodka could be found for well under £10.

Evidence from Wales found that the policy was associated with reduced alcohol purchases, with the largest effects among younger drinkers who favoured cheap, high-strength products. Drinkers under 28 decreased cider consumption by about 50% compared to England, though some appeared to switch to lager, with spending on that category rising by about a third.¹⁵ Broader reviews of minimum pricing policies have found they are effective at reducing consumption among those who drink the most heavily, with some evidence of greater reductions among women.¹⁶

Modelling work from the United States has estimated that setting a minimum price per standard drink for spirits could meaningfully reduce both consumption and alcohol-related deaths. One state-level analysis found that pricing the cheapest spirits at roughly 45 cents per standard drink could cut total alcohol consumption by about 4% and prevent around 8% of alcohol-attributable deaths annually.¹⁷ The reason spirits keep showing up in these policy discussions is precisely because of how many units are packed into a relatively cheap bottle. A litre of budget vodka at 40% ABV is 40 units of alcohol, and before minimum pricing, it could be the cheapest way to get drunk by a wide margin. The unit count on the bottle is not just a health curiosity; it is the variable that pricing policy is built around.