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Alcohol Awareness Guidelines

Know Your Legal LimitApproximate Blood Alcohol Percentage in One HourIntoximeters’ “Drink Wheel”

Know Your Legal Limit

In Texas that means .08 percent of Blood Alcohol Content or any amount which results in loss of normal use of mental or physical facilities. This is only a guide and not sufficiently accurate to be considered legal evidence. The figures you calculate are averages. Individuals may vary somewhat in their personal alcohol tolerance. Food in the stomach affects the rate of absorption. Medications, health, and psychological condition are also influential factors. In any case, if you’ve been drinking at all, be careful!

Approximate Blood Alcohol Percentage in One Hour


DrinksBody Weight in PoundsInfluence
 100120140160180200220240 
1.04.03.03.02.02.02.02.02Possible Impairment
2.06.06.05.05.04.04.03.03
3.11.09.08.07.06.06.05.05Impaired
4.15.12.11.09.08.08.07.06
5.19.16.13.12.11.09.09.08Legally Intoxicated
6.23.19.16.14.13.11.10.09
7.26.22.19.16.15.13.12.11
8.30.25.21.19.17.15.14.13
9.34.28.24.21.19.17.15.14
10.38.31.27.23.21.19.17.16

Subtract .015 percent for each hour of drinking. One drink is:

  • 1 oz. of 80 proof liquor at 40%;
  • 12 oz. of beer at 4.5 percent; or
  • 4 oz. of wine at 12%.

The surest policy is, “Don’t Drive After Drinking.”
Texas Alcoholic Beverage Commission

Intoximeters’ “Drink Wheel”

Another way to determine your Blood/Breath Alcohol Content (BAC) is to use The Intoximeters, Inc. “Drink Wheel.” It is a form that you can fill out and, upon completion, will instantly compute your estimated blood/breath alcohol concentration.