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Blood Alcohol Concentration Calculator

Alcohol intoxication is not governed by the amount of units that you drink.  It is governed by the amount of units you drink in what time period.  This determines how much alcohol is in your blood stream at any one given point in time, and as such, the physiological effects that alcohol will have on your body.

Blood Alcohol Concentration (BAC) is literally the percentage of your blood that is concentrated with alcohol. So, a BAC of 0.10 means that 0.1% of your bloodstream is composed of alcohol.  As men have larger livers and women have more body fat, the differences in BAC between the genders can be very significant on the same dose of alcohol.  Body weight also influences BAC, as well age, ethnicity and tolerance levels to a lesser degree.

Explanation of BAC levels :

.020 - Light to moderate drinkers begin to feel some effects
.040 - Most people begin to feel relaxed
.060 - Judgment is somewhat impaired
.080 - Definite impairment of muscle coordination and driving skills.
.100 - Clear deterioration of reaction time and control. This is legally drunk in all states.
.120 - Vomiting usually occurs 
.150 - Balance and movement are impaired. Here the equivalent of a 1/2 pint of whiskey is circulating in the blood stream.
.200 - Most people begin to experience blackouts
.300 - Many people lose consciousness
.400 - Most people lose consciousness and some die
.450 - Breathing stops. This is a fatal dose for most people


To calculate BAC, use the calculator below.  As a practice, recall the last time that you drank alcohol.  You will need to enter your:

  • Gender

  • Body weight & height (there are 14 lbs in a stone)

  • Drinks consumed

  • Time you spent drinking

Please Note:  No scores are recorded or any personal data stored from completing this BAC Calculator.