Alcohol Units Calculator (UK)
Work out how many UK units of alcohol are in a drink from its size and strength, and how that compares with the weekly guideline.
New: please check your results.
- Alcohol units
- 2.27 units
- Share of the 14-unit weekly guideline
- 16.23%
What it does
A UK unit is 10 ml of pure alcohol. Enter the size and strength of a drink, and how many, to see the units and how much of the 14-unit weekly low-risk guideline that is.
How to use it
- Drink size
How much is in one drink. Choose ml, cl, litres, pub measures, shots, pints or fl oz in the Units box. A UK pint is 568 ml, a large glass of wine 250 ml, a standard glass 175 ml, and a bottle of wine 75 cl (750 ml). A dram or single of whisky or other spirits is a 25 ml or 35 ml measure in UK pubs.
- Strength (ABV)
The alcohol by volume, printed on the label. Beer and cider are often 4 to 5%, wine 11 to 14%, spirits around 40%.
- Number of drinks
How many of these drinks.
Common uses
- Keeping track of units across a week.
- Comparing drinks: a strong pint can have more units than a glass of wine.
- Checking how many calories you need.
- Checking your BMI. Try the BMI Calculator
The formula
Units = ABV × volume in ml ÷ 1,000Where:
- ABV
- alcohol by volume, as a percentage (e.g. 4 for 4%)
One UK unit is 10 ml (8 g) of pure alcohol.
Worked example
A 568 ml pint at 4%:
- Units: 4 × 568 ml ÷ 1,000 = 2.27 units
- That's 16.23% of the 14-unit weekly guideline.
Questions people ask
What is the weekly guideline?
The UK guideline is no more than 14 units a week, spread over 3 or more days, for both men and women. It's a low-risk limit, not a target.
How many units are in a bottle of wine?
A 750 ml bottle of 13% wine has 9.75 units: 13 × 750 ÷ 1,000. That's most of the weekly guideline in one bottle.
Are UK units the same as standard drinks elsewhere?
No. A UK unit is 8 g of alcohol, while a US standard drink is 14 g and other countries use different sizes. This calculator uses UK units.
Last checked 24 October 2026