Blood Alcohol Content (BAC) Calculator

The formula (drinks 14) / (weight 0.68) - (0.015 time) is a simplified version of the Widmark formula, commonly used to estimate Blood Alcohol Concentration (BAC). It calculates the approximate percentage of alcohol in the bloodstream based on the number of standard drinks consumed (each containing about 14 grams of pure alcohol), body weight (in pounds, converted to grams using 0.68 as a distribution factor for men, or 0.55 for women), and the time elapsed since drinking began. The term (0.015 time) accounts for the average metabolic rate at which the body processes alcohol (about 0.015% BAC per hour). Variations of this formula may adjust the distribution factor (0.68 for men, 0.55 for women) or the metabolic rate (0.017 for faster metabolizers). This estimate is not exact, as factors like food intake, genetics, and individual metabolism can influence BAC. Always use caution when interpreting results, as legal limits and personal tolerance vary.

A Blood Alcohol Content (BAC) Calculator is a useful tool for estimating the concentration of alcohol in your bloodstream based on factors such as the number of drinks consumed, body weight, and the time elapsed since drinking. The formula used in this calculator, (drinks 14) / (weight 0.68) - (0.015 * time), takes into account the standard alcohol content per drink (14 grams), the body weight in pounds, and the rate at which alcohol is metabolized over time (approximately 0.015% per hour). This calculation provides an approximate BAC level, which can help individuals gauge their impairment and make informed decisions about driving or other activities.



It’s important to note that BAC levels can vary based on additional factors such as gender, metabolism, food intake, and individual tolerance. While this calculator offers a helpful estimate, it should not be relied upon as a definitive measure of impairment. Always err on the side of caution and avoid driving if you’ve consumed alcohol. For legal or medical purposes, a breathalyzer or blood test administered by professionals is the most accurate way to determine BAC. Use this tool responsibly to promote safety and awareness regarding alcohol consumption.