Estimate blood alcohol concentration (BAC) using the Widmark formula, based on drinks consumed, body weight, gender, and time elapsed since drinking began.
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This calculator uses the Widmark formula, a standard method for estimating BAC: BAC = (total alcohol consumed in grams ÷ (body weight in grams × distribution ratio)) × 100, minus the alcohol eliminated over time at a typical average rate of about 0.015% per hour. The distribution ratio (0.68 for men, 0.55 for women, on average) reflects that alcohol distributes through body water, and body water proportion differs between sexes on average.
A standard drink is commonly defined as containing about 14 grams of pure alcohol (roughly a 12 oz beer, a 5 oz glass of wine, or a 1.5 oz shot of spirits in the US), adjustable if you're measuring differently.
This calculator provides a rough mathematical estimate only. Actual BAC is affected by many factors this formula cannot fully account for, including food intake, drinking rate, medications, individual metabolism, and body composition, and it is not a reliable way to determine whether it's safe for you or anyone else to drive or perform other tasks requiring sobriety. Never use this or any BAC estimate as the basis for deciding to drive; when in doubt, don't.
No. This is a rough estimate for educational purposes only, individual factors can cause your actual BAC to differ meaningfully from this estimate. Never use a BAC calculator, this one or any other, to decide whether it's safe to drive.
In the US, a standard drink is generally defined as about 14 grams of pure alcohol, roughly a 12 oz regular beer, a 5 oz glass of wine, or a 1.5 oz shot of distilled spirits. This can be adjusted in the calculator if your drinks are stronger, weaker, or a different size.
The Widmark formula's distribution ratio reflects average differences in body water percentage between men and women, which affects how alcohol distributes through the body, though individual variation within each gender is significant.
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