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The glasses below contain the same amount of alcohol.
The formula generally used to work out the units of alcohol consumed is:
Alcohol Strength (ABV) % x Volume = units
1000
A pint works out at 568ml, a small wine glass is usually 75ml or 125ml for a large measure, and a single measure of spirits is 25ml. The strength of the alcohol is listed on the bottle as a % vol. Some examples therefore:
A glass of wine (12% Alcohol Strength)
12 x 75 = 0.9 units
1000
A large glass of wine (12% Alcohol Strength)
12 x 125 = 1.5 units
1000
A single malt whisky (40% Alcohol strength)
40 x 25 = 1 unit
1000
A pint of beer (4.5% Alcohol strength)
4.5 x 568 = 2.56 units
1000
It is recommended that men do not regularly consume more than 3-4 units a day, and women 2-3 units per day.
The legal limit for driving is 80 micrograms of alcohol per 100 ml of blood. The breath test limit is 35micrograms 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.
Never offer a drink to a driver
Stick to non-alcoholic and soft drinks
Arrange for someone who is not drinking to drive
Take a taxi
Use public transport
Stay overnight
The only safe course is not to drink and drive
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