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Blood Alcohol Concentration %BAC Guide

The measure of impairment is directly related to several factor such as weight, gender, and body metabolism. Women are more susceptible to the effects of alcohol than men. The following charts are organized based on weight and genders only.

Drinks
/
Hour
Estimated Percentage of Blood Alcohol Content %BAC
MALE
Weight in Pounds
100
120
140
160
180
200
220
240
1
.04
.03
.03
.02
.02
.02
.02
.02
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
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

Drinks
/
Hour
Estimated Percentage of Blood Alcohol Content %BAC
FEMALE
Weight in Pounds
 
 
100
120
140
160
180
200
220
240
1
.05
.04
.03
.03
.03
.02
.02
.02
2
.09
.08
.07
.06
.05
.05
.04
.04
3
.14
.11
.10
.09
.08
.07
.06
.06
4
.08
.15
.13
.11
.10
.09
.08
.08
5
.23
.19
.16
.14
.13
.11
.10
.09
6
.27
.23
.19
.17
.15
.14
.12
.11
7
.32
.27
.23
.20
.18
.16
.14
.13
8
.36
.30
.26
.23
.20
.18
.17
.15
9
.41
.34
.29
.26
.23
.20
.19
.17

Widmark's BAC formula calculates one's Blood Alcohol Concentration level at any given time is:

%BAC = (A x 5.14/W x r) - .015 x H

Where:

  • "A" is the total number of liquid ounces of alcohol consumed by the person since the commencement of drinking. This figure is ascertained by multiplying the number of liquid ounces of alcoholic beverages consumed by the percentage of alcohol in the beverage. For example, a typical bottle of regular beer contains .60 liquid ounces of alcohol (12 oz. X 5%). A typical glass of table wine contains .60 liquid ounces of alcohol (5 oz. X 12%). And, most hard liquors contain 40 per cent alcohol by volume with a typical size of drink being 1.25 ounces and so a typical shot of hard liquor contains .50 ounces of alcohol (1.25 oz x 40%).
  • The 5.14 in the formula is a conversion factor of .823 x 100/16, wherein .823 is used to convert liquid ounces to ounces of weight, 100 is used to convert the final figure to a percentage, and 16 is used to convert pounds to ounces.
  • The 0.15 figure appearing in the formula is the average alcohol elimination rate.
  • "W" is for weight of the person in pounds
  • "r" in the alcohol distribution ratio which for men is .73 and for women is .66.
  • "H" is the period in hours during which alcohol was eliminated from the bloodstream and this is usually the total number of hours between commencement of drinking and the time the BAC calculation is made.

Note: This is a very well-known formula. Widmark is very famous in this area of work. The formula is not full proof but only a guide.

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