Alcohol affects individuals differently. Your blood alcohol level may be affected by your age, gender, physical condition, amount of food consumed and any drugs or medication. In addition, different drinks may contain different amounts of alcohol, so it’s important to know how much and the concentration of alcohol you consume.

For purposes of this guide, “one drink” is equal to 1.25 oz. of 80 proof liquor, 12 oz. of regular beer, or 5 oz. of table wine.

A woman drinking an equal amount of alcohol in the same period of time as a man of an equivalent weight may have a higher blood alcohol level than that man. Therefore, women should refer to the female “Know Your Limits” chart.

Some states have set .08% Blood Alcohol Concentration (BAC) as the legal limit for Driving Under the Influence while others are .10%. For commercial drivers, a BAC of .04% can result in a DUI conviction nationwide.

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Men Approximate Blood Alcohol Percentage Drinks Body Weight in Pounds 100 120 140 160 180 200 220 240 0 .00 .00 .00 .00 .00 .00 .00 .00 Sober 1 .04 .03 .03 .02 .02 .02 .02 .02 Impairment Begins 2 .08 .06 .05 .05 .04 .04 .03 .03 Skills Begin to be Affected Possible Criminal Penalties 3 .11 .09 .08 .07 .06 .06 .05 .05 4 .15 .12 .11 .09 .08 .08 .07 .06 5 .19 .16 .13 .12 .11 .09 .09 .08 6 .23 .19 .16 .14 .13 .11 .10 .09 7 .26 .22 .19 .16 .15 .13 .12 .11 Legally Intoxicated 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 .01% for each 40 minutes of drinking. One drink is 1.25 oz. of 80 proof liquor, 12 oz. of beer, or 5 oz. of table wine.

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Women Approximate Blood Alcohol Percentage Drinks Body Weight in Pounds 90 100 120 140 160 180 200 220 240 0 .00 .00 .00 .00 .00 .00 .00 .00 .00 Sober 1 .05 .05 .04 .03 .03 .03 .02 .02 .02 Impairment Begins 2 .10 .09 .08 .07 .06 .05 .05 .04 .04 Skills Begin to be Affected Possible Criminal Penalties 3 .15 .14 .11 .10 .09 .08 .07 .06 .06 4 .20 .18 .15 .13 .11 .10 .09 .08 .08 5 .25 .23 .19 .16 .14 .13 .11 .10 .09 6 .30 .27 .23 .19 .17 .15 .14 .12 .11 Legally Intoxicated 7 .35 .32 .27 .23 .20 .18 .16 .14 .13 8 .40 .36 .30 .26 .23 .20 .18 .17 .15 9 .45 .41 .34 .29 .26 .23 .20 .19 .17 10 .51 .45 .38 .32 .28 .25 .23 .21 .19 Subtract .01% for each 40 minutes of drinking. One drink is 1.25 oz. of 80 proof liquor, 12 oz. of beer, or 5 oz. of table wine.