BAC Calculator | Free Blood Alcohol Calculator (Drink & ABV Based)

BAC Calculator | alcoholpercentage.info

BAC (Blood Alcohol Concentration) Calculator

Accurate Widmark-based estimator. Clean, modern, and responsive — aligned with alcoholpercentage.info.

Used for body water constant (r): 0.68 for males, 0.55 for females.
Enter your weight. Choose kg or lbs. We convert to grams for the calculation.
Type volume with unit, e.g. 500 ml, 0.5 L, 12 oz. If no unit is typed, we use the selector on the right.

Tip: Automatic unit conversion for ml, L, oz.

Typical beer 4–6%, wine 11–14%, spirits ~40%.
%
Elimination rate assumed at 0.015 BAC units per hour.

For educational purposes only. Do not drink and drive. Legal limits vary by region.

Your Estimated BAC

0.00%

    This is an estimate using the Widmark formula. Actual BAC varies with many factors (food, metabolism, medications). Never rely on estimations to determine fitness to drive.

     

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