BAC Calculator

Estimate your Blood Alcohol Concentration (BAC) based on drinks, body weight, gender, and time.

Gender

Male Female

Units

Metric (kg) Imperial (lb)

Weight

Number of Drinks

Volume per Drink (ml)

Alcohol % (ABV)

Hours Since First Drink

Your BAC: %

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About BAC

Blood Alcohol Concentration (BAC) measures the amount of alcohol in your bloodstream. It affects coordination, judgment, and reaction time.

How This Calculator Works

This tool uses the Widmark formula: BAC = (Alcohol Consumed / (Body Weight × r)) × 100 – (0.015 × hours). Gender factor (r) is 0.68 for men, 0.55 for women. Alcohol elimination rate is ~0.015% per hour.

Health & Safety

This is an estimate. Do not rely on it for legal driving or medical purposes. BAC varies based on metabolism, medications, food intake, and health conditions.