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Using the Blood Alcohol Content Calculator

The BAC Blood Alcohol Content Level Calculator estimates the ratio of blood to alcohol in a person's body from an array of factors.


To calculate your blood alcohol content (bac) level, fill in the factors in the form below and click "Estimate Alcohol Blood Content". For any factors you don't know, trust the defaults, as they are most likely correct. Generally...
  • A bottle or can of beer is 12oz. (341ml) and contains 5% alcohol.
  • A liquor drink contains 1.5oz. of hard liquor which is 40% (80 proof)
  • A glass of wine is 5oz. and contains 12% alcohol.

    • BAC Calculator

    I am   Male      Female     
    and I weigh
    and started drinking hour(s) ago

    Blood Alcohol Content

    Blood Alcohol Content, or BAC is a measure of the concentation of alcohol in a person's blood. It is the metric most commonly used to determine a person's level of intoxication.

    Beer
    I drank x
    at
    Liquor
    I drank x
    at
    Wine
    I drank x
    at
    Blood Alcohol
    Content (BAC)
    0.000%

    Legal Limits

    Vehicle operating bac limits by country.


    Disclaimer: Laws are always changing, these legal bac limits might be outdated. Legal limits can vary depending on age, state, province, etc. Different metrics are used to determine BAC, such as breathalyzer (BrAC), blood test or urinalysis. Therefore these legal limits for operation of a vehicle are not exhaustive, and potentially incorrect.

    No blood alcohol level calculator is perfect, the tools provided on this site are used for estimation purposes only.

    The Blood Alcohol Content Calculator was created by TJ Bourke.