Blood Alcohol Content (BAC) Calculator

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Last Edited: March 10, 2024
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.

A Blood Alcohol Calculator (BAC) is a valuable tool designed to estimate your blood alcohol concentration level, which is the percentage of alcohol in your bloodstream. By inputting factors like your weight, the amount and type of alcohol consumed, and the time span over which you’ve been drinking, the calculator provides an approximation of your BAC, helping you understand how intoxicated you might be. Uses of a BAC Calculator:

  • Assessing Impairment: Helps estimate how intoxicated you are, indicating potential impairment levels.
  • Making Informed Decisions: Aids in deciding whether it’s safe to drive or if alternative transportation is needed.
  • Understanding Alcohol’s Effects: Offers insight into how different amounts of alcohol affect your BAC over time.
  • Promoting Responsibility: Encourages responsible drinking and awareness of alcohol’s impact on the body.
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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How many drinks have you had?
Beer 12oz
-5% ABV
Wine 12oz
-12% ABV
Liquor 1.5oz
-40% ABV
Time since first drink?

Alcohol Withdrawals

Alcohol withdrawal refers to a range of symptoms that can occur when an individual who has been drinking excessively for weeks, months, or years suddenly stops or significantly reduces their alcohol consumption. Symptoms can range from mild to severe and include anxiety, tremors, insomnia, nausea, and seizures. In severe cases, it can lead to a life-threatening condition known as delirium tremens, characterized by confusion, rapid heartbeat, and high blood pressure. Withdrawal occurs because the brain adapts to the alcohol’s presence over time and becomes unbalanced when alcohol is abruptly removed, leading to these physiological and psychological symptoms. Learn more about the phases of alcohol withdrawals.

Signs & Symptoms

Alcoholism, or alcohol use disorder, manifests through various signs and symptoms that can be physical, behavioral, and psychological. Key indicators include:

  • Cravings: A strong, often irresistible compulsion to drink.
  • Physical Dependence: Experiencing withdrawal symptoms like sweating, shaking, and nausea when not drinking.
  • Tolerance: Needing to consume more alcohol to feel the same effects.
  • Loss of Control: Drinking more or for a longer period than intended.
  • Neglect of Activities: Giving up important social, occupational, or recreational activities.
  • Continued Use Despite Consequences: Persisting in drinking even when it causes physical, social, or interpersonal problems.
  • Inability to Quit: Repeated unsuccessful attempts to cut down or stop alcohol use.

Alcoholic Liver Disease

Alcoholic liver disease is a condition resulting from prolonged excessive consumption of alcohol, leading to irreversible damage to the liver, an organ crucial for detoxification and metabolism. It encompasses a spectrum of liver disorders, including fatty liver, alcoholic hepatitis, and chronic hepatitis with liver fibrosis or cirrhosis. Symptoms may vary from none to severe and can include jaundice, abdominal pain, swelling, and confusion. The disease progresses in stages, initially starting with fat accumulation in liver cells, advancing to inflammation and liver cell death, and potentially culminating in cirrhosis, where the liver becomes scarred and permanently damaged, impairing its function. Learn more about Alcoholic Liver Disease.