What is BAC?

What is BAC? 

BAC refers to the percent of alcohol in a person’s blood stream. A BAC of .10 percent means that an individual’s blood supply contains one part alcohol for every 1,000 parts blood.

In California, a person is legally intoxicated if he/she has a BAC of .08 percent or above.

Factors that determine BAC
  • Number of standard drinks (see below)
  • Amount of time in which drinks are consumed
  • Body weight
  • Gender
  • Food (to a much lesser extent)
One standard drink = 1/2 ounce of ethyl alcohol
  • One 12 oz. regular beer (4.5 percent alcohol) = .54 oz.
  • One 7 oz. malt liquor (7 percent alcohol) = .49 oz.
  • One 4.5 oz. glass of wine (12 percent alcohol) = .54 oz.
  • One jigger (1.25 oz.) of 80-proof liquor (40 percent alcohol) = .50 oz.
  • One-third jigger (.5 oz.) of Everclear (95 percent alcohol) = .48 oz.
More than one standard drink > 1/2 ounce
  • One 16 oz. cup of beer = .72 oz. = 1.4 drinks
  • One 40 oz. beer = 1.8 oz. = 3.6 drinks
  • One 22 oz. malt liquor = 1.5 oz. = 3 drinks
  • One 12 oz. glass of wine = 1.4 oz. = 2.9 drinks
  • One 12 oz. margarita = 2-4 drinks, depending on ingredients
  • One 12 oz. cup of trashcan punch = 4-10 drinks, depending on ingredients
Estimated and Approximate BAC for Men*

Male BAC

Estimated and Approximate BAC for Women*

BAC Female

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