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Written by the EachTools Team

Last updated: January 2026

How Blood Alcohol Content Is Calculated

BAC is estimated using the Widmark formula, which considers alcohol consumed, body weight, gender, and time elapsed since drinking started.

Formula

BAC = (Alcohol consumed in grams / (Body weight in grams × Widmark factor)) - (Elimination rate × hours)
Widmark factor: 0.68 (men), 0.55 (women)
Elimination rate: ~0.015/hour

Steps

Select your gender and enter your weight.
Input the type and amount of alcoholic beverages consumed.
Enter when you started drinking.
View your estimated BAC and time until sober.

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