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Understanding Blood Alcohol Concentration


Warning and Release

Before using the blood alcohol calculator you must check the boxes below and click the "I Accept" button.

I understand that although a person's BAC can be estimated, the exact level cannot be determine solely by the number of drinks consumed, and cannot be precisely calculated by a person's weight and gender. This blood alcohol calculator is to be used as a guideline only and should NOT be used as the sole way to determine someone's blood alcohol concentration or intoxication level.

I understand that the blood alcohol calculator is being provided to me on an "as is" basis and that I am using it entirely at my own risk. I further understand that Smart Serve Ontario is disclaiming all representations, warranties, conditions, guarantees or conditions of any kind either express or implied regarding the completeness, accuracy, reliability, usefulness, availability or appropriateness of the tool, including any results that may be obtained from my use. I acknowledge that the results may include technical inaccuracies and that Smart Serve Ontario, its directors, officiers or employees will not be liable to me for any damages of any kind arising from my use of the blood alcohol calculator tool.

How to use this calculator:


Click on the four key variables that apply to your situation:

    1. Your sex – male or female
    2. Your weight in pounds (lbs.)
    3. Number of hours you’ve been drinking
    4. Total number of drinks you’ve had

Refresh the page when any of the key variables are changed.

A Blood Alcohol Concentration (BAC) chart is a general guideline only and NOT the sole way to determine someone’s intoxication level.
Other factors to consider when assessing BAC:

  • Age
  • Absorption rate
  • Amount and type of food eaten
  • Physical health and fitness level
  • Medications/Drugs

Impairment begins with the first drink.