If you’re travelling this holiday season, get to know your destination’s drink driving rules. Some countries have a legal Blood Alcohol Concentration (BAC) limit of 0.02, or 0.08, and some destinations might even have a strict zero tolerance rule for all drivers.
Blood Alcohol Content, or BAC is a measure of the concentration of alcohol in a person’s blood. It is the metric most commonly used to determine a person’s level of intoxication, so you’ll find countries stating that the legal drink driving limit is 0.05%BAC or 0.02%BAC.
In some countries, the measure BrAC may be used instead and if you’re using a breathalyzer that reads in BAC, you’ll have to do some conversion.
BAC is expressed in grams of alcohol per 100ml of blood or %BAC, whereas BrAC is usually expressed as mg/l.
To convert BrAC to BAC, breathalysers use the golden ratio of 2100:1 based on the blood concentration that evaporates and is expelled in the lungs.
Or, just check out the tab below on BAC to BrAC conversions for a quick reference on what a certain BrAC level is in %BAC 😉