Calculators

BAC Calculator

Estimate blood alcohol with the Widmark formula.

Sex

Weight unit

Body weight (kg)Number of drinksDrink type (sets alcohol grams)Grams of alcohol per drinkHours since first drink

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Total alcohol consumed—

Eliminated over time—

Time until below 0.08% limit—

Time until BAC returns to 0—

This free blood alcohol content (BAC) calculator estimates your BAC using the Widmark formula, based on your sex, body weight, how much you drank, and how long ago. The result is a rough guide only — actual BAC depends on many factors this estimate cannot capture, and it should never be treated as a green light to drive. Never drive after drinking.