Blood Alcohol Level Calculator
Estimate your blood alcohol concentration (BAC) based on gender, weight, number of drinks, and time elapsed. Use this tool for educational purposes only.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Blood Alcohol Level Calculator
This tool estimates your Blood Alcohol Content (BAC) for educational purposes. Follow these steps:
- Select Gender – Choose Male or Female from the dropdown. This affects the alcohol distribution ratio (r).
- Enter Weight – Input your weight in pounds (lbs). Must be greater than 0.
- Enter Number of Drinks – Input how many standard drinks you’ve consumed (0 or more).
- Enter Hours Since First Drink – Input the time elapsed in hours (use 0.5 for half hours). Must be 0 or more.
- Click “Calculate BAC” – Your estimated BAC percentage appears, along with a severity level (e.g., Sober, Mildly Impaired, etc.).
Note: The formula accounts for alcohol metabolism over time. Results are approximations and should not be used for legal or medical decisions.
Previous Results
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Frequently Asked Questions
Blood Alcohol Concentration (BAC) is the amount of alcohol in your bloodstream, measured as a percentage. It is used to determine legal intoxication levels.
This calculator provides an estimate based on the Widmark formula. Actual BAC can vary based on metabolism, food intake, and other factors. Do not use this to make decisions about driving or safety.
In most US states, the legal limit for driving is 0.08% BAC. Many countries have lower limits. Always check local laws.
