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Alcohol unit calculation

For guidance on units of alcohol, personal alcohol unit calculators and more information on your health and wellbeing click here

Calculations of units of alcohol

The table below shows the measures which contain the same unit of alcohol.

  • Beer ½ pint measure
  • Wine 125ml measure
  • Port/Sherry 50ml measure
  • Spirits 25ml measure


It is recommended that both men and women should not regularly drink more than 14 units per week to keep health risks from drinking alcohol low. If you do drink up to 14 units per week, it’s best to spread these evenly across a few days and have at least two drink-free days a week.

Alcohol limits

The legal limit for driving is 80 micrograms of alcohol per 100 ml of blood. The breath test limit is 35 micrograms in 100ml of breath

There is no fail safe guide as to how much you can drink to stay under this limit.

The amount and type of alcoholic drink, and your height, weight and metabolism will all play their part.

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