BAC Calculator
(blood alcohol content)

Fluid Ounces Consumed (oz.): oz.
Percent Alcohol (%): %
Your Weight (lbs): lbs
Hours Consuming Drink: hrs
BAC Percentage:
BAC Analysis:

BAC (Blood alcohol content)

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.

FLUID OUNCES (oz.)

  • Beer ~ 12 oz.
  • Wine Glass ~ 4 oz.
  • 1 Shot ~ 1.5 oz

ALCOHOL PERCENTAGE

  • Beer ~ 4-4.5%
  • Wine ~ 15-20%
  • 1 Shot ~ 30-50%

HOURS CONSUMING DRINK

  • 2.5 hours = 2.5
  • 30 minutes = .5
  • 15 minutes = .25

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:

BAC Chart for Men (Male)

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 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.

BAC Chart for Women (Female)

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 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.