Beer: size and strength work together
A 330 ml bottle at 5% is 1.65 UK units. A 500 ml serving at the same strength is 2.5 units. At 8%, that 500 ml serving becomes 4 units. Same drink category; different number.
Wine: “one glass” is not enough information
125 ml of wine at 12% is 1.5 units. A 175 ml glass at 13% is 2.275 units; a 250 ml glass at 13% is 3.25. If you pour by eye, the calculation is an estimate too.
Spirits: a small pour still counts
25 ml at 40% is 1 unit; 50 ml at the same strength is 2 units. For a cocktail, count the alcoholic ingredients separately. The full glass volume including ice and juice does not provide the right calculation.
Check your serving
Take the volume, label ABV and quantity. Our calculator can add several drinks and display UK units, approximate grams, Spanish UBE and US standard drinks.
These are calculations, not suggested drinking amounts. They cannot guide driving or personal medical decisions.
