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BAC & time until sober after drinks
Your body processes alcohol at a fairly predictable rate — roughly 0.15‰ per hour using the widely accepted Widmark formula. That means if your blood alcohol concentration (BAC) peaks at 1.2‰ after a few drinks, your body needs approximately 8 hours to bring it back to 0.0‰. This alcohol metabolism calculator takes the guesswork out of that math by asking you what you drank and giving you a clear answer: when exactly will you be sober again?
The Widmark formula accounts for your body weight and biological sex, because these factors directly affect how alcohol distributes through your body. A 90 kg man and a 60 kg woman drinking the same amount will reach very different peak BAC levels — and therefore very different "sober again" times. Knowing your actual numbers is far more useful than rough guesses like "I'll be fine after a few hours of sleep."
Let's say a 75 kg man has 3 standard beers (each roughly 0.33 L at 5% ABV) over one hour. His estimated peak BAC might reach around 0.6–0.7‰. At a 0.15‰/h elimination rate, he would return to 0.0‰ in approximately 4 to 5 hours. If he had 5 beers instead, that peak rises closer to 1.0–1.1‰, pushing the sober time out to nearly 7 hours or more.
For a 60 kg woman consuming the same 3 beers, her peak BAC would likely be noticeably higher — possibly 0.8–0.9‰ — because women generally have a lower body water percentage. That adds another hour or two before she hits 0.0‰. These differences are exactly why generic rules like "one drink per hour" can be misleading for so many people.
Using an alcohol burnoff calculator like this one on simple-calculator.online gives you a personalized estimate based on your own profile, not a one-size-fits-all average. It's a practical tool for planning your evening responsibly — whether you're deciding when it's safe to drive the next morning or simply curious about how your body handles alcohol.
This alcohol metabolism calculator is designed to give you a reliable estimate of your peak BAC and how long until sober based on the Widmark formula. However, real-world metabolism varies due to factors like food intake, hydration, fatigue, medication, liver health, and individual genetics. The 0.15‰/h elimination rate is a well-researched average, but some people metabolize faster or slower.
Never use this tool to decide whether you are legally safe to drive. Legal BAC limits vary by country, and even low BAC levels affect reaction time and judgment. The only way to know your actual BAC in real time is through a certified breathalyzer test.
The Widmark formula is widely used in forensic science and medical research. It provides a solid estimate, but individual factors like food consumption and metabolism speed can shift results by 20–30% in either direction.
No. Only time reduces your BAC. Coffee may make you feel more alert, but it does not speed up how long until sober — your liver processes alcohol at its own fixed rate regardless.
Yes. This tool is intended for informational purposes only and does not replace professional medical advice. If you have concerns about alcohol consumption or its health effects, consult a qualified healthcare professional.