Last updated October 13, 2026 · Report an error
The UK and several EU countries measure alcohol consumption in "units" — a system introduced specifically to give the public an easy, consistent way to gauge how much pure alcohol they're actually drinking, since the same volume of different drinks (a strong craft beer vs. a light lager, a large glass of wine vs. a small one) can contain very different amounts of alcohol. One UK unit equals 10 mL (about 8 g) of pure alcohol, which is a distinct measure from the US "standard drink" (14 g of pure alcohol) used by American health guidance — so the same physical drink converts to a different number depending on which country's system you're using. This tool calculates UK-style units from a drink's volume and ABV (alcohol by volume percentage), making it easy to check a given drink against UK public health guidelines. This calculator is for general reference and educational purposes only — it is not medical advice, and it does not assess alcohol dependency or provide a personal health recommendation. Consult a doctor or qualified professional for guidance specific to your health and drinking patterns.
How it works
Enter the drink's volume in milliliters and its ABV (alcohol by volume) percentage, both of which are printed on virtually all alcoholic beverage labels. The tool applies the standard UK unit formula: units = volume (mL) × ABV (%) ÷ 1000. This works because ABV percentage represents the proportion of the drink's total volume that is pure alcohol, so multiplying volume by that percentage (as a decimal, hence dividing by 1000 rather than 100 to also convert from mL to the 10 mL-per-unit definition) yields the pure alcohol content translated directly into units.
- Enter drink volume (mL).
- Enter aBV (%).
- Click Calculate to see your results.
Examples
A UK pint of beer
A 568 mL pint at 5% ABV contains 568 × 5 ÷ 1000 = 2.84 UK units.
A standard glass of wine
A 175 mL glass of wine at 12% ABV contains 175 × 12 ÷ 1000 = 2.1 UK units.
A single shot of spirits
A 25 mL measure of spirits at 40% ABV contains 25 × 40 ÷ 1000 = 1.0 UK unit — which is why a single standard UK spirit shot is often described as "1 unit" in public health messaging.
Who should use it
- Tracking weekly alcohol units against UK health guidelines.
- Comparing the alcohol content of different drinks before choosing one.
- Understanding how serving size and ABV together affect total unit count.
Industry applications
- Public health
- Personal wellness tracking
Advantages
- Matches the exact UK/EU public health unit system.
- Simple, transparent formula.
- Works for any drink once you know its volume and ABV.
Limitations
- Not directly comparable to US standard drinks without a separate conversion.
- Doesn't account for individual factors like body weight, sex, or tolerance.
Common mistakes to avoid
- Mixing up UK units with US standard drinks when reading guidance from a different country's health authority.
- Assuming all beers, wines, or spirits have the same standard ABV — actual ABV varies significantly even within the same drink category.
- Underestimating total weekly units by mentally rounding down larger servings or stronger drinks to "one drink = one unit."
Best practices
- Check the ABV printed on the actual bottle/can rather than assuming a "typical" percentage — ABV varies significantly even within the same drink category.
- Track total units across a full week, not just a single evening, since UK guidance is framed as a weekly limit spread across several days.
- Use measured serving sizes rather than estimating volume by eye, since home-poured drinks are often larger than a standard measure.
Tips
- For the US standard-drinks system instead, see the Cocktail ABV Calculator elsewhere on this site.
- Remember that a larger-than-standard pour (a generous home glass of wine, for instance) can contain noticeably more units than the "standard serving" figure.