Back to Blog

    Alcohol Units in the UK: Why a Taproom Pint Can Top 3 Units

    Pint and smaller beer pour at taproom

    One unit of alcohol is 10 ml (8 g) of pure alcohol, and the UK guideline is to drink no more than 14 units a week, spread over 3 or more days. The NHS sets out how to work this out from a drink’s strength and size, and places like us at Lost And Found Taproom show what that looks like on a real menu.

    TL;DR:

    • Calculate units by multiplying ABV percentage by volume in milliliters, then dividing by 1,000; a 750 milliliter bottle of 13.5% wine contains roughly 10 units.
    • A 250 milliliter glass of 13% wine holds about 3.25 units, while a 5.2% pint approaches 3, so check the ABV and serving size.
    • Free Drinkaware and Alcohol Change calculators use a drink’s ABV and actual serving volume to estimate units and track weekly totals without mental arithmetic.
    • Scotland’s breath limit is 22 micrograms per 100 milliliters, compared with 35 elsewhere in the UK; unit counts cannot establish whether you can drive legally.
    • People who are pregnant or trying to conceive should avoid alcohol entirely because no amount has been shown to be risk free.
    Lost And Found Taproom
    Explore Brighton’s Independent Beer Scene
    Lost+Found Taproom brings together rotating local brews and UK craft beers in a welcoming Fiveways space.
    Visit Lost+Found Taproom

    Table of Contents

    How to calculate units from ABV and volume

    The maths behind a unit is simple once you have two numbers: the drink’s ABV (alcohol by volume, shown as a percentage on the label) and its volume in millilitres. Multiply them together, then divide by 1,000.

    1. Pint of 4% beer (568 ml): 4 × 568 ÷ 1,000 = roughly 2 units.
    2. Pint of 5.2% craft beer (568 ml): 5.2 × 568 ÷ 1,000 = 2.95 units.
    3. 175 ml glass of 12.5% wine: 12.5 × 175 ÷ 1,000 = about 2 units.
    4. 25 ml measure of 40% spirit: 40 × 25 ÷ 1,000 = 1 unit.

    The NHS calculation method confirms this formula, ABV percentage multiplied by volume in millilitres, divided by 1,000, and a 750 ml bottle of 13.5% wine works out to roughly 10 units using the same sum. ABV is printed on every can, bottle and menu by law, so the only variable you need to check each time is the percentage, not the drink type.

    Quick reference: units in common drinks

    Quick reference: units in common drinks — overview diagram

    Rough unit values help with quick decisions, but ABV varies by brand and style, so treat the figures below as a starting point rather than a fixed rule.

    These figures broadly match the examples Drinkaware publishes for standard servings.

    • A “large” 250 ml wine glass at 13% ABV holds around 3.25 units, more than a single pub measure might suggest.
    • Craft beers and strong ciders often sit well above 4% ABV, so a pint can easily carry 3 units or more.
    • Always check the label or menu when a drink looks or sounds stronger than the average, rather than assuming it falls into the standard “2 units a pint” estimate.

    Interpreting the 14-unit weekly guideline in practice

    The UK Chief Medical Officers recommend staying under 14 units a week for both men and women, spread across at least three days rather than consumed in one or two sessions, with several drink-free days built in. There is no single number that marks a “safe” amount to drink on one occasion: drinking heavily in a short space of time raises short-term risks regardless of your weekly total. For anyone pregnant or trying to conceive, clinical guidance is to avoid alcohol altogether, since no amount has been shown to be risk-free at that stage.

    Spreading your units across the week, rather than banking them for a Friday night, is the practical core of the guidance.

    • Alternate alcoholic drinks with water or a soft drink.
    • Build in two or three drink-free days every week.
    • Choose a lower-ABV beer or a smaller wine measure when you’re counting units closely.

    Pro Tip: Decide your drink-free days in advance, before the week starts, rather than deciding on the night.

    Drink-driving limits across the UK and why units can’t guarantee safety

    Legal drink-drive limits differ depending on where you are in the UK, and they’re set in breath and blood measurements rather than units.

    • England, Wales and Northern Ireland: 35 microgrammes of alcohol per 100 millilitres of breath, or 80 milligrammes per 100 millilitres of blood.
    • Scotland: 22 microgrammes per 100 millilitres of breath, or 50 milligrammes per 100 millilitres of blood, a lower threshold than the rest of the UK.

    These statutory limits mean unit counting alone cannot tell you whether you’re under the limit. Body weight, metabolism, food intake and even stress affect how quickly alcohol clears your system, so two people drinking the same number of units can register very different results. The safest approach before driving is to avoid alcohol entirely rather than try to estimate your way under the limit.

    Using unit calculators and checking ABV: step-by-step practical guidance

    Doing the sums by hand works, but a calculator removes the guesswork, particularly after a few drinks when mental maths gets harder. Drinkaware and Alcohol Change both offer free online tools built for UK drinkers, where you enter a drink’s ABV and volume and it returns the unit total and running weekly tally.

    1. Find the ABV on the bottle, can or menu, it’s a legal labelling requirement.
    2. Note the volume you’re actually being served, not just the standard serving size.
    3. Enter both into a calculator, or apply the ABV × volume ÷ 1,000 formula yourself.

    In a bar or taproom, if the ABV isn’t printed on the board, ask a member of staff, they’ll have it to hand.

    A local taproom example: checking ABV and measures at Lost And Found

    We have beer and food menus available online, with ABV listed alongside each beer so you can work out units before you arrive. If you’re managing your weekly total, picking a lower-ABV beer, asking for a smaller pour, or sharing a bottle between two glasses all help keep the count down. Our beer menu and on-tap listings are the easiest places to check before you set off.

    A sensible way to think about units

    Units work best as an awareness habit, not a strict ledger. A quick label check or a minute with a calculator, done regularly, matters more than getting every single pour exact.

    — Author

    Lost And Found: check ABV on our menu before you visit

    Our beer and food menus are available online with ABV shown wherever it’s available, so you can plan your evening and pick lower-ABV options before you even arrive. Lost And Found Taproom

    If you’re organising something bigger, our venue hire gives you exclusive use of the space with no hire fee, and you can set the drink selection to suit your guests. Ask our staff about measures and ABV on the night, or check the on-tap menu in advance to plan ahead.

    This article is general information, not a substitute for advice from a qualified doctor. Consult a qualified healthcare professional about your own circumstances before acting on anything here.

    Lost And Found: check ABV on our menu before you visit — overview diagram

    FAQ

    Is a pint of beer 2 units?

    A pint of average-strength beer (around 4% ABV) works out to roughly 2.3 units, not exactly 2, and a stronger craft beer at 5.2% reaches closer to 3 units. Always check the ABV on the can, bottle or menu rather than assuming a flat “2 units a pint” rule, since strength varies widely by brand.

    There’s no fixed number of pints that applies to everyone, because the legal drink-drive limits are set in breath and blood alcohol concentration, not units, and these are affected by body weight, metabolism and food intake. Two pints could put one person over the England and Wales limit of 35 microgrammes per 100 ml of breath while leaving another under it, so the only reliable approach is not to drink at all before driving.

    Can I drive with 4 units of alcohol?

    Units don’t translate directly into a pass or fail against the legal limit, since the statutory limits are measured in breath or blood alcohol concentration, which depends on factors unique to each person. Four units could leave one person over the limit and another closer to it but still over, so the safest choice is to avoid driving after drinking any amount.

    Can you drive after 1 unit of alcohol in the UK?

    Even a single unit raises your blood alcohol level, and how close that puts you to the legal limit depends on your body weight, metabolism and how recently you’ve eaten. Because individual variability is significant, the only way to be certain of staying within the law is not to drink before driving.

    Sources

    Back to Blog