Alcohol units calculator
Add up UK alcohol units, grams of alcohol and standard drinks for a list of drinks.
A clear answer. Here’s how.
UK alcohol units = volume in millilitres × ABV percentage ÷ 1,000, because one unit is 10 ml (8 g) of pure alcohol. Grams of ethanol use a density of 0.789 g/ml and a US standard drink is 14 g. The UK Chief Medical Officers’ low-risk guideline is no more than 14 units a week, spread over three or more days. Pour sizes and labelled strengths vary, so totals are estimates.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Drinks (CSV)
Drink,Millilitres,ABVPercent,Count Pint of lager,568,4,2 Large glass of wine,250,12.5,1 Single whisky,25,40,2
Example result
| Drink | Millilitres | ABV % | Count | UK units each | UK units total | Pure alcohol (g) | US standard drinks |
|---|---|---|---|---|---|---|---|
| Pint of lager | 568 | 4 | 2 | 2.27 | 4.54 | 35.9 | 2.56 |
| Large glass of wine | 250 | 12.5 | 1 | 3.13 | 3.13 | 24.7 | 1.76 |
| Single whisky | 25 | 40 | 2 | 1 | 2 | 15.8 | 1.13 |
| Total | 9.67 | 76.3 | 5.45 |
UK units = millilitres × ABV% ÷ 1,000 (one unit is 10 ml or 8 g of pure alcohol). Grams use ethanol density 0.789 g/ml, and a US standard drink is 14 g. UK Chief Medical Officers advise no more than 14 units a week, spread over three or more days. Labelled ABV can differ slightly from the drink poured.