AUTORIDE | All about cars
AUTORIDE | All about cars

Blood Alcohol Content (BAC) Calculator

Body weight in pounds
Beer 12oz5% ABV
Wine 5oz12% ABV
Liquor 1.5oz40% ABV
Time since first drink
Disclaimer: The result of this calculator is just a rough estimation of the BAC level based on your input. It is not intended to replace the medical advice of a professional health care provider and should not be relied upon. None of the BAC calculators is 100% accurate since there are numerous other variables as well as individual conditions which are not taken into account.

The blood alcohol content (BAC) calculator helps to estimate the amount of alcohol in an individual's bloodstream. Our calculator calculates the approximate concentration of alcohol in the blood and estimates how long it will take for the BAC to drop to zero. In other words, a BAC of 0.1% would translate to 0.1 grams of alcohol per 100 mL of blood.

The concentration of alcohol in the blood is affected by various factors, including weight, gender, amount of alcohol consumed, and time elapsed since you started drinking. For example, women generally have a lower alcohol tolerance than men because they have less water in their bodies.

Effects of Blood Alcohol Content (BAC)

Behavior and impaired abilities vary depending on the amount of alcohol in the blood. The effect of alcohol starts at a very low level, at which concentration, the ability to think, or peripheral vision immediately deteriorate. The table below provides an overview of the effects of alcohol in the blood on behavior and the effect on the organism.

In addition, a larger amount of alcohol in the blood impairs motor skills and reaction time and can seriously negatively affect the body. If there is too much alcohol in the blood, loss of consciousness, coma, or death can occur.

BAC (%)


Effect on body

0.001 – 0.03%


Negligible changes

0.03 – 0.06%

Mild euphoria, joy, talkativeness

Worse concentration

0.06 - 0.10%

Euphoria, numb feelings, extraversion

Decreased ability to think, reduced sensitivity to pain, worse peripheral vision

0.10 – 0.20%

Excessive talkativeness, stormy emotions, nausea/vomiting

Worse reaction time, worse motor skills, inability to express oneself

0.20 – 0.30%

Nausea/vomiting, emotional swings (anger, sadness), decreased libido, stiffness

Imbalance, poor motor skills, possible loss of consciousness, memory loss

0.30 – 0.40%

Heavy/rapid breathing, blackouts, inability to walk

Depression of the central nervous system, increased heart rate, low probability of death

0.40 – 0.50%

Heavy/rapid breathing, inability to walk, unconsciousness, depression, coma

Severe depression of the central nervous system, high heart rate,

alcohol intoxication, probability of death


Risk of death

Effect of Alcohol on Driving

Increased alcohol consumption has adverse long-term impacts in addition to short-term effects. In this case, however, we are interested in short-term results, especially when drunk driving.

The drunk driving tolerance varies between countries, but if we omit those with zero tolerance for drunk driving, the limit for blood alcohol content is usually 0.05% (BAC). The effect of alcohol is negligible on motor skills up to this limit, although it already affects concentration. However, if we go just slightly above this limit, impaired peripheral vision and decreased ability to reason occur, which is dangerous when driving a vehicle.

Bear in mind that even with a lower blood alcohol content, a person may have a worse ability to drive a vehicle, especially if he is taking a specific type of medication, has a metabolic disorder or a medical condition that, in combination with any amount of alcohol, impairs his ability.