The safest bet is to not drive if you have consumed any alcohol at all, but you can work out how many units your drinks contain with our alcohol units calculator:
Our alcohol unit calculator
Know your limits
Many people drink drive because they don't know their limits.
The guideline for the legal UK drink-drive limit is three to four units for men, and three for women.
However, this is not an exact science and you will know your limits better than anyone else. So if after one you feel tipsy, then it's better to be safe than sorry and stay out of the car.
In the UK, the drink-drive alcohol limit for drivers is:
- 80 milligrammes of alcohol per 100 millilitres of blood
- 35 microgrammes per 100 millilitres of breath
- 107 milligrammes of alcohol per 100 millilitres of urine
Despite this guidance, there's no foolproof way of drinking and staying under the limit because alcohol affects each individual differently.
Factors such as your weight, gender, stress levels and whether you've eaten recently all affect the amount of alcohol absorbed into the blood. So the best advice is to not drink and drive.
But if you want to know how many units your drinks contain, you use this Alcohol Unit Calculator*.
*The Alcohol Unit Calculator is intended as a rough guide only, and is NOT a substitute for common sense. None for the road is the best approach.