Estimates blood alcohol concentration percentage, impairment category, legal driving evaluation, and metabolism time based on the Widmark formula.
Estimate Blood Alcohol Concentration (BAC), impairment level, and hours until sober.
Lowered alertness, judgment, and reduced coordination.
Estimated time until fully sober: ~3.5 hrs
Evidence-based estimations. Consult a physician for personalized guidance.
Official clinical definitions and validated mathematical models
Estimates blood alcohol concentration based on ingested ethanol grams, volume of distribution (r), and hepatic zero-order metabolic degradation (β).
| BAC Level | Clinical Impairment Stage | Psychomotor Symptoms | Legal Status |
|---|---|---|---|
| 0.00% – 0.02% | Normal / Negligible | Slight mood elevation, baseline motor control | Legal to drive (most states) |
| 0.02% – 0.05% | Mild Impairment | Altered judgment, relaxation, mild loss of visual tracking | Commercial / zero-tolerance limit |
| 0.05% – 0.08% | Moderate Impairment | Reduced coordination, delayed reaction time, impaired judgment | Illegal driving limit in many nations |
| 0.08% – 0.15% | Legally Intoxicated | Loss of balance, speech slurring, impaired speed perception | Illegal per se driving threshold in US/UK |
| 0.15% – 0.30% | Severe Intoxication | Major motor dysfunction, vomiting, blackouts, stupor | Extreme danger, risk of alcohol poisoning |
| > 0.30% | Life-Threatening / Coma | Respiratory depression, loss of consciousness, risk of death | Medical emergency |
Medical Disclaimer: This calculator is an educational estimate and cannot account for stomach contents, medications, liver enzymes, or tolerance. NEVER use this tool to determine whether it is safe or legal to drive.
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