How To Count Alcohol Units
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1. The UK unit formula
Alcohol math matters more than most drinkers realize. A “glass of wine” can mean 125ml at 11% ABV or 250ml at 14.5% — nearly triple the alcohol for the same name. If you want to stay inside health guidelines, track your tolerance, or just know what you’re actually drinking, you need a consistent unit. The UK uses “units” (10ml of pure alcohol), the US uses “standard drinks” (14g of pure alcohol), and bartenders use neither. This guide gives you the formulas, the thresholds, and the quick mental shortcuts so you can count accurately no matter what’s in your glass.
2. The US “standard drink”
One UK unit = 10ml (8g) of pure ethanol. The formula is simple:
3. Weekly guidelines
The US defines one standard drink as 14g (17.7ml) of pure alcohol. That’s roughly 1.75 UK units. The typical US rules of thumb:
4. Wine math is where most people lose count
Beer ABV ranges from ~3% (light lager) to 12%+ (imperial stouts). Quick table for a UK pint (568ml):
5. Beer math by strength tier
A single strong IPA pint can exceed a full glass of wine. “Just one pint” isn’t a fixed dose.
6. Spirits and cocktails
For fast estimation, memorize these:
7. Shortcut mental math
Round up when you’re unsure. Underestimating is the default failure mode.
8. Converting UK units to US drinks
One US standard drink = 1.75 UK units. To convert:
9. Time and blood alcohol
UK weekly cap of 14 units = roughly 8 US standard drinks. US daily cap of 2 drinks = 3.5 UK units. Same ethanol, different packaging.
10. Common mistakes
Your liver processes about one unit per hour (one US standard drink every ~90 minutes). If you drink 4 units in an hour, you’re carrying 3 units’ worth of alcohol into the next hour. Food slows absorption but doesn’t reduce the total. Coffee doesn’t sober you up — only time does.
11. Run the numbers
Plug in the ABV and volume of your actual drink rather than guessing. Then pair it with your daily calorie math — alcohol is 7 kcal/g, second only to fat.