Blood Alcohol Concentration (BAC) Calculator 🍺
Estimate your blood alcohol concentration and how long it may take to become sober.
Warning: This is only a theoretical estimate and does not replace legal or medical testing. Never drink and drive.
Estimated Blood Alcohol Concentration (BAC)
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EstimatedLikely effects
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Understanding Blood Alcohol Concentration (BAC)
Widmark’s formula is one of the most widely used methods to estimate BAC. It takes into account:
- Body weight: People with higher body mass have more body water to dilute alcohol.
- Biological sex: On average, males have a higher proportion of body water than females, which affects alcohol distribution.
- Metabolism: The body eliminates alcohol at an average rate of about 0.015% BAC per hour, although this can vary.
In addition to body weight and biological sex, several other factors can change your BAC:
- Food in the stomach: Eating slows down alcohol absorption.
- Speed of drinking: Drinking quickly leads to a higher BAC peak.
- Alcohol content of drinks: Different beverages have very different concentrations (Beer ~5%, Wine ~12%, Spirits ~40%).
- Medications and health conditions: Liver disease, medications, and fatigue can significantly alter metabolism.
Legal BAC limits vary by country and even by region (commonly 0.05% or 0.08% for drivers). Some jurisdictions adopt a near-zero tolerance policy, especially for professional or young drivers.
Regardless of the legal threshold where you live, the safest recommendation is always the same: if you drink, do not drive or operate machinery.
Reference table of common effects
| BAC (%) | Common effects |
|---|---|
| 0.02 – 0.03% | Mild relaxation, slight change in mood. |
| 0.05 – 0.06% | Reduced inhibition, impaired judgment, feeling of warmth. |
| 0.08 – 0.09% | Reduced motor coordination, slower reaction time. (Illegal to drive in many countries). |
| 0.10 – 0.15% | Slurred speech, impaired balance, possible nausea. |
| > 0.20% | Confusion, memory blackouts, risk of coma and respiratory depression. |
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Total volume in this line: 350 ml