Blood Alcohol Concentration (BAC) Calculator

BAC is around 0%
It will take around 0 more hours to reach 0%.
Average individual appears normal.
* The results are meant for educational purposes only and are not intended to replace the medical advice of doctors or health care providers. Please consult your health care provider regarding specific health conditions.
About You
In order to accurately calculate your blood alcohol content (BAC), it's important to take into account how your individual physical characteristics can impact your body's reaction to alcohol.
Your gender
Your weight
Change to kg
Alcohol Details
What did you drink?
How strong it was? (% ABV)
This field is required
What size was your drink?
Change to ml
This field is required
Change to ml
Time when started drinking

About BAC Calculator

Please note, even though doctors and phlebologists with degrees developed the algorithm for this BAC calculator, it is provided for informational purposes only and is not intended to be used as a legal or medical reference.

The calculation is an approximation and should not be relied upon to determine if it is safe or legal to operate a vehicle or perform other activities that require a certain level of sobriety. Individual factors such as body composition, food consumption, and medication usage can significantly affect blood alcohol concentration.

It is recommended to use a certified alcohol breathalyzer or other reliable means of testing BAC for accurate results. We strongly advise against driving under the influence of alcohol and recommend using taxi, Uber, or designated driver service instead.


How BAC Calculator works

BAC is a measure of the amount of alcohol present in the bloodstream. When alcohol is consumed, it is absorbed into the bloodstream through the stomach and small intestine, and then distributed throughout the body, including the brain. The liver metabolizes alcohol at a fairly constant rate, but the body can only process a limited amount of alcohol per hour.

The legal BAC limit for driving varies by country and state, but in many places it is 0.08%, meaning that a person with a BAC of 0.08% or higher is considered legally intoxicated and prohibited from operating a vehicle. However, it’s important to note that even lower levels of alcohol can impair a person’s driving ability, judgment, and reaction time.

Factors that can affect BAC levels include the amount and type of alcohol consumed, the person’s weight and gender, and how quickly the alcohol was consumed. Food consumption can also affect BAC levels, as eating food before or during drinking can slow the absorption of alcohol into the bloodstream.

As a phlebotomist with a passion for road safety who has performed over 1000 alcohol blood tests, I strongly advise against drinking and driving, and encourage everyone to make responsible choices when it comes to alcohol consumption and transportation.

How Different BAC % Affects Your Driving

BAC Level Effects on Behavior Potential Impact on Driving
0.02-0.03% Mild euphoria and relaxation Slight reduction in coordination and ability to track moving objects
0.04-0.06% Feeling of well-being, relaxation, lower inhibitions Reduced coordination, difficulty steering, reduced response time to emergency driving situations
0.07-0.09% Slight impairment of balance, speech, vision, reaction time Significant reduction in reaction time and control, difficulty detecting danger, impaired judgment, poor coordination
0.10-0.125% Significant impairment of coordination, speech, balance, judgment Reduced ability to maintain lane position and brake appropriately, increased risk of crash involvement
0.13-0.15% Gross motor impairment and lack of physical control, blurred vision and major loss of balance Far less coordination and ability to control vehicle, potential for crashes resulting in serious injury or death
0.16-0.19% Dysphoria (unpleasant mood), sickness, need for assistance in walking and standing Potential for blackouts, loss of consciousness, and life-threatening alcohol poisoning
0.20%+ Loss of consciousness, risk of death Significant risk of life-threatening alcohol poisoning

About the author

Ashley Cresswell

Ashley Cresswell is a former phlebotomist with a passion for road safety. During her time as a phlebotomist, Ashley administered over 1000 blood alcohol tests to impaired drivers and was shocked to discover that many of them were simply uninformed about the legal limits for driving under the influence. As a result, Ashley conducted extensive research on scientific studies and local laws to bring drivers a comprehensive resource on drink and drive limits from around the world.