BAC Calculator

Estimate your blood alcohol level based on your height, weight, number of drinks consumed, and time since consumption.

BAC Legal Limits

Blood Alcohol Level

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 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 100 mL of blood.


The blood alcohol calculator above is meant to be an estimation and by no means is it an accurate representation of actual BAC levels. For that you will need a certified breathalyzer. These however are expensive to purchase, so the above calculator can be used for an estimation. If you are in doubt, don’t ever drive.

Another note is that different types of alcohol effect people in different ways. This calculator does not take any of those into account.