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BC’s Responsible Beverage Service Program

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Alcohol Effects


How to calculate Blood Alcohol Concentration

The following table outlines the typical blood alcohol concentration of people of varying weight, based on the number of standard drinks he or she has consumed.

This chart is provided for information only, as a means to estimate blood alcohol concentration (BAC). Many factors can affect a person's BAC, including amount of alcohol consumed, rate of consumption, food consumption, and factors specific to each person such as gender, age, weight, height and metabolism.



Please note the following:
  • Actual BAC may differ from the numbers on this chart.
  • Impairment begins with one drink.
  • It may take up to 30 minutes after the last drink of alcohol for a person to reach the highest BAC level.
  • Mixing energy drinks, drugs or other medications with alcohol can increase a person's level of impairment.
  • If a person's BAC is over .08, the person is considered impaired under the Criminal Code of Canada.
  • If a person's BAC is .05 or over, the person is considered impaired under British Columbia's Motor Vehicle Act.
  • Different drinks contain different concentrations of alcohol.