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Blood alcohol content (BAC), also called blood alcohol concentration, blood ethanol concentration, or blood alcohol level, is most commonly used as a metric of alcohol intoxication for legal or medical purposes. Blood Alcohol Content is the legal name for BAC but Blood Alcohol Concentration is sometimes used for simpler description.
Blood alcohol concentration is usually expressed as a percentage of ethanol in the blood in units of mass of alcohol per volume of blood or mass of alcohol per mass of blood, depending on the country. For instance, in North America a BAC of 0.1 (0.1% or one tenth of one percent) means that there are 0.10 g of alcohol for every dl of blood.
There are many factors that affect your Blood Alcohol concentration (BAC) when you drink. Some of these include: a persons size, gender and physical condition; what they have had to eat; how much sleep they have had; what medications they are taking and, importantly, the actual alcohol content of their chosen drink.
Size and gender difference are reflected in the following estimated charts:
| Drinks | |||||||||
| 100 | 120 | 140 | 160 | 180 | 200 | 220 | 240 | ||
| 0 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | Only Safe Driving Limit |
| 0 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | Only Safe Driving Limit |
| 1 | .04 | .03 | .03 | .02 | .02 | .02 | .02 | .02 | Driving Skills Significantly Affected Possible Criminal Penalties |
| 2 | .08 | .06 | .05 | .05 | .04 | .04 | .03 | .03 | |
| 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 | Legally Intoxicated Criminal Penalties |
| 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 | Death Possible |
| 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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| Drinks | Body Weight in Pounds | |||||||||
| 90 | 100 | 120 | 140 | 160 | 180 | 200 | 220 | 240 | ||
| 0 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | Only Safe Driving Limit |
| 0 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | Only Safe Driving Limit |
| 1 | .05 | .05 | .04 | .03 | .03 | .03 | .02 | .02 | .02 | Driving Skills Significantly Affected Possible Criminal Penalties |
| 2 | .10 | .09 | .08 | .07 | .06 | .05 | .05 | .04 | .04 | |
| 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 Criminal Penalties |
| 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 | Death Possible |
| 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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