BAC Calculator (Blood Alcohol Content)
Estimate your blood alcohol content with the Widmark formula — based on weight, gender, drinks, and elapsed time
Disclaimer: This calculator provides estimates only. BAC varies by individual metabolism, food intake, and other factors. Never drink and drive.
1 drink = 12 oz beer (5%), 5 oz wine (12%), or 1.5 oz spirits (40%)
Widmark Formula
BAC = (A × 5.14 / W × r) - 0.015 × H
- • A = alcohol consumed (oz)
- • W = body weight (lbs)
- • r = gender constant (0.73 male, 0.66 female)
- • H = hours elapsed
- • BAC decreases ~0.015% per hour
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