How long does alcohol stay in your blood?
On average, it takes about one hour for your body to break down one unit of alcohol. However, this can vary, depending on your weight, whether you’re male or female, your age, how quickly or slowly your body turns food into energy (your metabolism), how much food you have eaten, the type and strength of the alcohol and whether you’re taking medication and, if so, what type. It can also take longer if your liver isn’t working normally.
How much is one unit?
One unit is equivalent to 10ml or 8g of pure alcohol. There are roughly:
2.1 units in a standard glass (175ml) of average-strength wine (12%)
3 units in a large glass (250ml) of average-strength wine (12%)
2 units in a pint of low-strength lager, beer or cider (3.6%)
3 units in a pint of higher-strength lager, beer or cider (5.2%)
1 unit in a single measure of spirits (25ml)
Adding up your units
If you drink a large (250ml) glass of wine, your body takes about three hours to break down the alcohol.
If you drink one pint of beer, your body takes about two hours to break it down. One pint of strong lager is equivalent to three units, so this will take longer.
However, this time can vary, depending on the factors mentioned above.
If you have a few drinks during a night out, it can take many hours for the alcohol to leave your body. The alcohol could still be in your blood the next day.
This means that if you drive the day after an evening of drinking, you could be over the legal alcohol limit.
Men and women are advised not to regularly drink more than 14 units a week. Spread your drinking over three days or more if you drink as much as 14 units a week