Alcohol Units Per Week Calculator
Instantly estimate how many alcohol units you drink each week based on drink type, strength (ABV), and how much you have. See how your total compares to UK low-risk drinking guidelines.
Calculate Your Weekly Units
Enter your typical drink details below to get an instant estimate of your weekly alcohol units, calculated using the standard UK unit formula and compared against the Chief Medical Officers’ low-risk guideline.
Units Estimator
Fill in your typical drink to see your weekly units breakdown
Choose the drink you have most often
Volume of one drink, e.g. 175ml glass
Check the bottle or can label
Total drinks of this size, per week
Spreading units over more days lowers single-session risk
Estimated Weekly Units
Breakdown based on the standard UK unit formula
Units In Common UK Drinks
Approximate units in typical UK servings, calculated as (volume in ml x %ABV) / 1000. Actual strength varies by brand, so always check the label where possible.
| Drink | Typical Serving | ABV | Units |
|---|---|---|---|
| Pint of lager | 568ml | 4.0% | 2.3 units |
| Pint of strong lager/IPA | 568ml | 5.5% | 3.1 units |
| Pint of cider | 568ml | 4.5% | 2.6 units |
| Small glass of wine | 125ml | 12.0% | 1.5 units |
| Standard glass of wine | 175ml | 12.0% | 2.1 units |
| Large glass of wine | 250ml | 12.0% | 3.0 units |
| Bottle of wine | 750ml | 13.0% | 9.75 units |
| Single spirit measure | 25ml | 40.0% | 1.0 unit |
| Alcopop / RTD bottle | 275ml | 5.0% | 1.4 units |
Alcohol Units FAQ
Everything you need to know about how UK alcohol units are calculated and what the guidelines mean.
One UK unit of alcohol is 10ml or 8g of pure alcohol. To work it out for any drink, multiply the volume in millilitres by the ABV percentage, then divide by 1000. For example, a 568ml pint at 4% ABV contains (568 x 4) / 1000 = 2.3 units.
The UK Chief Medical Officers advise that both men and women keep health risks from alcohol low by not regularly drinking more than 14 units a week. This should be spread evenly over three or more days, with several alcohol-free days each week, rather than saved up for one or two heavy sessions.
A standard 750ml bottle of wine at 13% ABV contains around 9.75 units, which is close to a full week’s low-risk guideline in a single bottle. A 175ml standard glass at the same strength is about 2.3 units, and a 250ml large glass is about 3.25 units.
Binge drinking is commonly defined as consuming more than 6 units in a single session for women or more than 8 units for men. Concentrating a week’s units into one or two sessions carries greater short-term risk than spreading the same total across several days.