Blood Alcohol Calculator

What is Blood Alcohol Concentration (BAC)?

Blood Alcohol Concentration (BAC) is the percentage of alcohol in your bloodstream. In many jurisdictions, 0.05% or 0.08% BAC is the legal limit for driving under the influence. BAC can be estimated using the Widmark formula.

Alcohol Metabolism Rate

On average, the body metabolizes alcohol at about 0.015% per hour. This varies by weight, gender, and individual constitution. Results from this calculator are for reference only.

How Alcohol Metabolism Works

About 20% of consumed alcohol is absorbed through the stomach, and the remaining 80% through the small intestine. The liver processes alcohol using the enzyme alcohol dehydrogenase (ADH), converting it to acetaldehyde, which is then broken down into acetate by aldehyde dehydrogenase (ALDH). The liver can process approximately 7 to 10 grams of alcohol per hour, and exceeding this capacity causes blood alcohol levels to rise.

Factors Affecting Alcohol Metabolism Rate

Higher body weight means more body water to dilute alcohol, resulting in lower BAC. Women generally have a higher BAC than men after consuming the same amount due to lower body water percentage. Drinking on an empty stomach speeds absorption significantly. People with genetic ALDH2 deficiency process acetaldehyde more slowly, leading to facial flushing and more severe hangovers.

Health Effects of Alcohol

Chronic heavy drinking can lead to serious liver diseases including cirrhosis, fatty liver, and alcoholic hepatitis. It also negatively affects the cardiovascular system, increasing the risk of hypertension and arrhythmia. Alcohol impairs brain function, causing memory loss and impaired judgment. Long-term excessive consumption is also associated with increased risk of several types of cancer. Maintaining moderate drinking habits is essential for health.