Blood Alcohol Calculator (BAC)

Drinking affects your Blood Alcohol Concentration (BAC). It is illegal to drive with a BAC of .08% (.04% if you drive commercial vehicles or .01% or more if under 21). Even a BAC below .08% does not mean that it is safe or legal to drive. To calculate your blood alcohol level, enter the following information in the form below:

  • FLUID OUNCES CONSUMEDOne Beer is approximately 12 ounces. One glass of wine is approximately 4 ounces. One Shot is approximately 1.5 ounces
  • YOUR WEIGHT Enter your body weight in pounds
  • ALCOHOL PERCENTAGE IN BEVERAGEBeer is approximately 4-4.5%. Wine is approximately 15-20%. Hard liquor is approximately 30-50%
  • HOURS CONSUMING DRINKĀ  Enter the number of hours from when you took your first drink
Fluid Ounces Consumed Percent Alcohol
Your Weight (Lbs) Hours Consuming Drink
BAC Percentage
BAC Analysis

Disclaimer: This is only to be used as a general test which is based on statistical averages and should NOT be used to determine whether you should drive. Your actual blood alcohol level may vary based upon many different variables.


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