A standard glass of wine, typically 175ml in volume, contains about 2.1 to 2.3 units of alcohol, assuming an average alcohol by volume (ABV) of around 12-13%

. The calculation for alcohol units is:

Units=Volume (ml)×ABV (%)1000\text{Units}=\frac{\text{Volume (ml)}\times \text{ABV (%)}}{1000}Units=1000Volume (ml)×ABV (%)​

For example, a 175ml glass of wine at 12% ABV would have:

175×12÷1000=2.1 units175\times 12\div 1000=2.1\text{ units}175×12÷1000=2.1 units

While a 175ml glass at 13% ABV would have about 2.3 units

. Larger glasses, such as 250ml at 12-13% ABV, contain roughly 3 units of alcohol

. In summary:

• Standard 175ml glass of wine (12-13% ABV): ~2.1 to 2.3 units
• Large 250ml glass of wine (12-13% ABV): ~3 units

This helps in understanding alcohol intake and keeping track of consumption according to health guidelines.