How many units in a red wine?

The number of units in a red wine varies depending on the alcohol content and serving size. In the UK, one unit of alcohol is defined as 10 milliliters (or 8 grams) of pure alcohol. Typically, a standard glass (175ml) of red wine at around 12% alcohol by volume contains approximately 2.1 to 2.5 units. Always check the label for specific details, as alcohol content can differ between wines.