As a rough guide, a standard drink contains about 10–12 grams of pure alcohol (see Figure 1). However, be aware that some restaurants and bars serve larger drinks than the standard. Also, there are differences in the assumed size and strength of a standard drink across European countries.

Figure 1: A standard drink: standard sizes of beer, wine, and spirits, which each contain approximately 10–12 grams of pure alcohol.

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From left to right: 10–12 grams of pure alcohol are contained in a 280-330 ml of beer, 150-180 ml of champagne, 30-40 ml of whisky or high-strength spirit, 60-80 ml of liqueur, and 100-120 ml of red wine.