The University of Texas at Austin - What Starts Here Changes The World
The University of Texas at Austin Division of Student Affairs
Navigation Menu
healthyhorns.utexas.edu

Blood Alcohol
Concentration (BAC)

What is BAC?

BAC refers to the percent of alcohol in a person's blood stream. A BAC of .10% means that an individual's blood supply contains one part alcohol for every 1000 parts blood.

In Texas, a person is legally intoxicated if he/she has a BAC of .08% or higher.

Factors that determine BAC

  • Number of standard drinks (see below)
  • Amount of time in which drinks are consumed
  • Body weight
  • Gender
  • Race/Ethnicity
  • Medications
  • Food (to lesser extent)

One standard drink:

  • One 12 oz. regular beer (4.5% alcohol)
  • One 7 oz. malt liquor (7% alcohol)
  • One 4.5 oz. glass of wine (12% alcohol)
  • One-third jigger (.5 oz.) of Everclear (95% alcohol)

More than one standard drink:

  • One 16 oz. cup of beer = 1.4 drinks
  • One 40 oz. beer = 3.6 drinks
  • One 22 oz. malt liquor = 3 drinks
  • One 12 oz. glass of wine = 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

This is an interactive program, developed by The Century Council with the University of Illinois, Urbana-Champaign, to educate the user about how alcohol consumption affects an individual's Blood Alcohol Concentration (BAC).