--- title: "Alcohol Units vs Standard Drinks" description: "UK alcohol units use 8 g ethanol; a US standard drink is 14 g. Compare NHS and NIAAA definitions so pour math does not get lost in translation." canonical: "https://orlyn.ai/guides/alcohol-units-vs-standard-drinks" last-updated: "2026-08-21" --- # Alcohol Units vs Standard Drinks Published 2026-08-21. Updated 2026-08-21. **Alcohol units vs standard drinks** is a translation problem. The [NHS](https://www.nhs.uk/live-well/alcohol-advice/calculating-alcohol-units/) defines one UK unit as 10 ml or 8 g of pure alcohol. [NIAAA](https://www.niaaa.nih.gov/alcohols-effects-health/alcohol-drinking-patterns) defines a US "standard drink" as any beverage containing 0.6 fl oz or 14 grams of pure alcohol. Same ethanol molecule, different yardsticks. This page compares definitions. It does not tell you what you "should" drink. ## Side-by-side definitions | Measure | Pure alcohol per measure | Common home | | --- | --- | --- | | UK alcohol unit | 8 g (10 ml) | NHS teaching and UK labels/guidance | | US standard drink | 14 g (about 0.6 fl oz) | NIAAA and many US public health tools | | Rough conversion | 1 US standard drink ≈ 1.75 UK units | Useful for reading foreign guidance | ## How each system counts a pour [NHS calculating guidance](https://www.nhs.uk/live-well/alcohol-advice/calculating-alcohol-units/) uses: ABV (%) × volume (ml) ÷ 1,000 = units. A pint (568 ml) of lager at 5.2% ABV is about 2.95 units. NHS examples also show a 750 ml bottle of 13.5% wine as 10 units, a 25 ml shot of 40% spirits as 1 unit, and a 175 ml glass of 12% wine as 2.1 units. [NIAAA's Core Resource](https://www.niaaa.nih.gov/health-professionals-communities/core-resource-on-alcohol/basics-defining-how-much-alcohol-too-much) illustrates one US standard drink as 12 fl oz regular beer at about 5% ABV, 5 fl oz table wine at about 12% ABV, or 1.5 fl oz of 80-proof spirits. Real craft beers, large wine glasses, and cocktails often exceed one standard drink. For a US-focused walkthrough, see [standard drink sizes](https://orlyn.ai/guides/standard-drink-sizes). | Drink example | Approx UK units (NHS-style) | Approx US standard drinks (NIAAA-style) | | --- | --- | --- | | 12 fl oz beer, 5% ABV | about 1.7 units | about 1.0 | | 5 fl oz wine, 12% ABV | about 1.4 units | about 1.0 | | 1.5 fl oz spirits, 40% ABV | about 1.7 units | about 1.0 | | 175 ml wine, 12% ABV | 2.1 units (NHS table) | about 1.2 | Numbers are teaching approximations. Labels and pour sizes vary. ## Why the mismatch confuses guidelines UK weekly guidance on the NHS page advises men and women who drink most weeks not to drink more than 14 units a week on a regular basis, spread over three or more days if drinking at that level, with drink-free days as a cut-down tactic. Fourteen UK units is 112 g ethanol, roughly eight US standard drinks of 14 g each, not fourteen US drinks. US moderate-drinking language from the [CDC](https://www.cdc.gov/alcohol/about-alcohol-use/moderate-alcohol-use.html) describes moderation as two drinks or less in a day for men and one drink or less in a day for women, using US drink equivalents. That is a different framing from a weekly UK unit cap. For US definition detail, see [moderate drinking definition](https://orlyn.ai/guides/moderate-drinking-definition). | Trap | What goes wrong | | --- | --- | | Reading "14" as 14 US drinks | Overstates UK weekly guidance by a wide margin | | Assuming a "glass of wine" is one unit and one standard drink | UK small/standard/large glasses differ; US pours often exceed 5 oz | | Ignoring ABV | Strong lager and high-ABV wine change both unit and standard-drink counts | ## What this page will not do - No personalized limit prescription - No claim that staying under a number erases risk - No driving guidance - No medical dosing People who drink heavily or daily should involve a clinician before stopping. Severe withdrawal symptoms such as seizures, hallucinations, or delirium tremens are medical emergencies. For urgent help, see [crisis resources](https://orlyn.ai/crisis). Related terms sit in the [sobriety glossary](https://orlyn.ai/guides/sobriety-glossary). ## Tracking across borders without double counting Travelers and internet readers constantly mix UK unit counters with US app logs. If a tracker assumes 14 g drinks and you enter NHS unit totals as if they were standard drinks, your weekly picture warps. Convert grams first, or pick one system and stay with it for a month so trends mean something. Cocktail recipes and large wine glasses break both systems when people count "glasses" instead of ethanol. Public guidelines also encode different philosophies: a UK weekly unit cap versus US per-day moderation language. Neither is a personalized medical order. Both still depend on knowing what one measure contains. When in doubt, read the ABV and the volume, then do the arithmetic once before the pour becomes a guess. If you are comparing terms across articles, prefer primary NIAAA, CDC, NHS, MedlinePlus, or peer-reviewed summaries over forum lore. Numbers and thresholds on this site are cited so you can re-check them. When a claim cannot be traced, it does not belong in YMYL health content. ## Practical takeaway Units and standard drinks both measure pure ethanol. They do not share the same gram size. Convert before you compare a UK article with a US tracker, and check ABV rather than trusting glass shape. Orlyn, which we make, is an iOS app with a live sober streak, daily check-ins, craving tools, and a 24/7 AI coach labeled as AI, not medical care. Use it as a complement to professional support when tracking change is part of a broader plan. ## FAQ Q: What is the difference between alcohol units and standard drinks? A: A UK alcohol unit contains 8 g (10 ml) of pure alcohol. A US standard drink contains about 14 g (0.6 fl oz) of pure alcohol. They are different teaching measures, not interchangeable one-for-one. Q: How many UK units equal one US standard drink? A: One US standard drink (14 g) is about 1.75 UK units (8 g each). Roughly two UK units are a bit more than one US standard drink. Q: How do I calculate UK units? A: NHS formula: strength (ABV as percent) times volume in ml, divided by 1,000. Example math belongs to labeled drinks, not to medical dosing. Q: What counts as one US standard drink? A: NIAAA: any drink with 14 grams or about 0.6 fluid ounces of pure ethanol, often illustrated as 12 oz beer at 5% ABV, 5 oz wine at 12% ABV, or 1.5 oz 80-proof spirits. Q: Are these limits medical advice? A: No. Unit and standard-drink definitions are measurement tools. Guideline numbers are public health definitions, not personalized prescriptions. ## Sources - Alcohol units (NHS) https://www.nhs.uk/live-well/alcohol-advice/calculating-alcohol-units/ - Understanding Alcohol Drinking Patterns (NIAAA) https://www.niaaa.nih.gov/alcohols-effects-health/alcohol-drinking-patterns - The Basics: Defining How Much Alcohol Is Too Much (NIAAA) https://www.niaaa.nih.gov/health-professionals-communities/core-resource-on-alcohol/basics-defining-how-much-alcohol-too-much - About Moderate Alcohol Use (CDC) https://www.cdc.gov/alcohol/about-alcohol-use/moderate-alcohol-use.html Related: [Standard Drink Sizes Explained](https://orlyn.ai/guides/standard-drink-sizes.md), [Moderate Drinking Definition](https://orlyn.ai/guides/moderate-drinking-definition.md), [Sobriety Glossary](https://orlyn.ai/guides/sobriety-glossary.md) Canonical HTML version of this page: https://orlyn.ai/guides/alcohol-units-vs-standard-drinks