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Drunk driving arrests are based on the Blood alcohol concentration (BAC) which is the amount of alcohol in the bloodstream. A BAC of .05% means the person has .05 grams of alcohol for every 100 mL of their blood.

As the liver metabolizes alcohol (at a rate of about one standard drink per hour), the BAC level drops unless more alcohol is consumed. A person's BAC is either measured with a breathalyzer, or by analyzing a sample of their blood. As the top DUI Attorneys we scrutinize every aspect of the BAC and make sure the tests are given correctly.

  • Fluid Ounces Consumed
    (Beer ~ 12 oz.    Wine Glass ~ 4 oz.   1 Shot ~ 1.5 oz)

  • Your Weight (Lbs)

  • Alcohol Percentage in Beverage
    (Beer ~ 4-4.5%     Wine ~ 15-20%      1 Shot ~ 30-50%)

  • Hours Spent Drinking

Fluid Ounces Consumed Percent Alcohol
Your Weight (Lbs) Hours Spent Drinking
BAC Percentage
BAC Analysis

This calculator is to be used for entertainment purposes only. *


The more a person drinks, the higher their BAC results are going to be. Two different people, who consume the same amount of alcohol, may have very different BAC results. Below is a list of some of the variables that are determining factors of your BAC.

  • Body Size: A smaller person will have a higher BAC than a larger person because the alcohol is concentrated in a smaller body mass.
  • Empty Stomach: Someone with an empty stomach will reach a higher BAC sooner than someone who has just eaten a meal. Food in the stomach slows down the rate at which alcohol passes into the bloodstream.
  • Body Fat: People with a lot of body fat tend to have higher BACs because alcohol is not absorbed into fatty tissue and the alcohol is concentrated in a smaller body mass.
  • Female: After drinking the same amount of alcohol, a woman will almost always have a higher BAC than a man.

Because of these variables, counting the number of standard drinks you consume can only give a rough guide to your BAC.

* DISCLAIMER: The results generated by the BAC Calculator are rough estimates of an average healthy person's BAC assuming typical beverage sizes, recipes and alcohol content. The BAC estimates generated by the BAC Calculator should not be used to infer anyone's fitness to work, drive or perform any other task or duty and is for entertainment purposes only.

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Veitch Ault & Associates offers exceptional representation for those charged with any misdemeanor offense from DUI and serious traffic matters, to DV-Assault.

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Each of our lawyers is rated 10/10 Superb by Avvo, an independant Attorney Rating Service. Further, Veitch Ault & Associates has been awarded Avvo's Client Choice Award in 2015, 2016 and 2017.

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Each of our lawyers has been repeatedly recognized by Washington State Super Lawyers as DUI/Criminal Defense "Rising Stars" and "Super Lawyers." The "Rising Star" distinction is awarded to only 2.5% of attorneys under the age of 40 in their respective practice areas, while the "Super Lawyers" distinction is awarded to only 5% of all attorneys in their respective practice areas.