Blood Alcohol Calculator

blood alcohol calculator header
Last Edited: September 29, 2021

Patricia Howard, LMFT, CADC

Clinically Reviewed
Andrew Lancaster, LPC, MAC

All of the information on this page has been reviewed and certified by an addiction professional.

Blood Alcohol Content (BAC) Calculator
Blood Alcohol Content, or BAC, is the percentage of alcohol in a person's bloodstream that is determined by weight and quantity of alcoholic beverage consumption. Your BAC can be measured within 30-70 minutes after drinking an alcoholic beverage. Knowing your BAC before you get behind the wheel can save your life and others from unexpected events. What is your BAC? Use our calculator to estimate what the blood alcohol content level is in your body. Our calculator can give you an approximate BAC level, do not rely of this to make decisions for you, use it to assess the risks you are willing to put yourself in when you drink and drive.
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Are you male or female?
How many drinks have you had?
Beer 12oz
-5% ABV
Wine 12oz
-12% ABV
Liquor 1.5oz
-40% ABV
Time since first drink?

The BAC calculator is meant for educational purposes only. The BAC calculator and information generated from it is not intended to replace the medical advice of your doctor or health care provider and should not be relied upon; nor do the BAC calculator or information generated from it constitute legal advice. Please consult your healthcare provider for advice about a specific medical condition and legal counsel for any legal questions. There is no blood alcohol calculator that is 100% accurate because of the numerous factors and complexities relating to alcohol consumption by of different individuals. In addition to the gender, body weight and amount of alcohol consumed in a time period, blood alcohol content of any individual person is influenced by that person’s metabolism, health issues, medications taken, history of alcohol consumption and the amount of food and non-alcoholic beverages eaten before or during alcohol consumption, among other factors. The best that can be done is a rough estimation of the BAC level based on known inputs.

Effects of Alcoholism on the body

Alcohol interferes with the brain’s communication pathways, and can affect the way the brain looks and works. These disruptions can change mood and behavior, and make it harder to think clearly and move with coordination.

Drinking a lot over a long time or too much on a single occasion can damage the heart, causing problems including:

  • Cardiomyopathy – Stretching and drooping of heart muscle
  • Arrhythmias – Irregular heart beat
  • Stroke
  • High blood pressure

Heavy drinking takes a toll on the liver, and can lead to a variety of problems and liver inflammations including:

  • Steatosis, or fatty liver
  • Alcoholic hepatitis
  • Fibrosis
  • Cirrhosis

Alcohol causes the pancreas to produce toxic substances that can eventually lead to pancreatitis, a dangerous inflammation and swelling of the blood vessels in the pancreas that prevents proper digestion.

Source: National Cancer Institute — see

Based on extensive reviews of research studies, there is a strong scientific consensus of an association between alcohol drinking and several types of cancer. In its Report on Carcinogens, the National Toxicology Program of the US Department of Health and Human Services lists consumption of alcoholic beverages as a known human carcinogen. The research evidence indicates that the more alcohol a person drinks—particularly the more alcohol a person drinks regularly over time—the higher his or her risk of developing an alcohol-associated cancer. Based on data from 2009, an estimated 3.5 percent of all cancer deaths in the United States (about 19,500 deaths) were alcohol related.

Click here to learn more about the phases of alcohol withdrawals.