Know how many units you’re drinking. This free alcohol units calculator turns a drink’s size and strength into units, shows the pure alcohol content, and compares your total to the low-risk weekly guideline.
Your drink
ml
%
drinks
1 UK unit = 10 ml of pure alcohol. A 330 ml beer at 5% ≈ 1.65 units.
Total alcohol units
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Enter your drink details
Units per drink
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Pure alcohol
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Vs 14-unit weekly guide
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Calories (approx)
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For awareness only. The UK low-risk guideline is to keep within 14 units a week, spread over 3+ days, with drink-free days. No level of drinking is risk-free — for support, talk to a healthcare professional.
Use this free alcohol units calculator to work out how many units are in your drinks. Enter the volume, strength (ABV) and number of drinks to see your total units and how they compare to the weekly low-risk guideline.
What this alcohol units calculator shows you
An alcohol units calculator measures the amount of pure alcohol in what you drink. Enter a drink’s size and strength, and it returns the units per drink, your total units, the grams of pure alcohol and how it compares to the 14-unit weekly guideline — a simple awareness tool for keeping track.
How alcohol units are calculated
Units = (Volume in ml × ABV%) ÷ 1000
One UK unit is 10 ml (about 8 g) of pure alcohol. A 330 ml beer at 5% works out to about 1.65 units; a 175 ml glass of 13% wine is around 2.3 units; and a pint of 4% beer is also roughly 2.3 units.
Units in common drinks
Drink
Size & strength
Units
Bottle of beer
330 ml @ 5%
~1.7
Pint of beer
568 ml @ 4%
~2.3
Glass of wine
175 ml @ 13%
~2.3
Large glass of wine
250 ml @ 13%
~3.3
Single spirit
25 ml @ 40%
1.0
What are the low-risk drinking guidelines?
UK health guidance advises keeping within 14 units a week for both men and women, spread over three or more days, with several drink-free days. Importantly, no level of drinking is completely risk-free — the guideline keeps risk low, rather than eliminating it.
How to use the alcohol units calculator
Enter the volume of one drink in millilitres.
Enter the ABV (alcohol by volume) shown on the label.
Add the number of drinks.
Choose the period — a single session or a week — and read your total.
Alcohol terms glossary
Term
What it means
Unit
10 ml (about 8 g) of pure alcohol.
ABV
Alcohol by volume — a drink’s strength as a percentage.
Low-risk guideline
Up to 14 units a week, spread out, with drink-free days.
Binge drinking
Drinking a large amount in a single session.
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