UK Alcohol Unit Calculator
Use this quick tool to estimate how many UK alcohol units are in your drink.
What is a UK alcohol unit?
In the UK, one alcohol unit is defined as 10 ml (or 8 g) of pure alcohol. Units are used to help you compare different drinks and track your intake more accurately than counting glasses or pints alone.
Because drink size and strength vary so much, two drinks that look similar may contain very different amounts of alcohol. This is why an alcohol unit calculator is useful for planning your week and reducing health risk.
How to calculate alcohol units
The standard UK formula
The calculation is straightforward:
Alcohol units = (Volume in ml × ABV %) ÷ 1000
For example, a pint of 4% beer is:
(568 × 4) ÷ 1000 = 2.27 units
Why ABV matters
ABV means "alcohol by volume." A stronger drink can contain far more units even if the glass size is the same. Many wines, craft beers, and cocktails are stronger than people expect.
Common UK drinks and approximate units
| Drink | Typical size | Typical ABV | Approx units |
|---|---|---|---|
| Pint of beer | 568 ml | 4% | 2.3 |
| Pint of cider | 568 ml | 5% | 2.8 |
| Large wine glass | 250 ml | 13% | 3.3 |
| Bottle of wine | 750 ml | 13% | 9.8 |
| Single spirit | 25 ml | 40% | 1.0 |
| Double spirit | 50 ml | 40% | 2.0 |
Tips to reduce alcohol units without giving up social life
- Switch to lower-ABV versions of your usual drink.
- Alternate alcoholic drinks with water or a zero-alcohol option.
- Choose smaller servings (half-pints, smaller wine glasses).
- Set a unit budget before going out.
- Plan alcohol-free days each week.
Frequently asked questions
Are units the same as calories?
No. Units measure alcohol strength and amount. Calories depend on alcohol plus sugars and mixers.
Do homemade cocktails have more units?
Often yes. Large pours and multiple spirits can quickly increase unit count.
Can I "save up" my 14 units for one night?
Not recommended. Spreading intake across the week lowers short-term and long-term risk.
Is this calculator medical advice?
No. It is an educational estimate. If you're concerned about drinking, speak to a GP or local support service.