The legal alcohol limit

The legal alcohol limit for drivers in the UK is:

  • 80 milligrams of alcohol per 100 millilitres of blood, or
  • 35 micrograms of alcohol per 100 millilitres of breath, or
  • 107 milligrams of alcohol per 100 millilitres of urine
 
There’s no way of you knowing how much you can drink and still stay under this limit – the safest thing is to never drink and drive.