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Advanced BAC calculator using the Widmark formula with drink tracking, metabolism factors, and real-time impairment assessment
Medical & Educational Tool
This calculator uses the scientifically validated Widmark formula for BAC estimation. Results are for educational purposes only and should not replace professional medical advice or legal BAC testing. Individual metabolism varies significantly. Created by health and wellness professionals to promote alcohol safety awareness.
This BAC calculator is based on the Widmark formula, the gold standard for BAC estimation developed by Swedish scientist Erik Widmark in the 1930s and still used by forensic scientists and medical professionals today. Our calculator incorporates additional factors including metabolism rate, food intake, age, and medication use to provide more accurate estimates. However, only certified breathalyzers and blood tests can provide legally valid BAC measurements.
Blood Alcohol Content (BAC) is the percentage of alcohol in your bloodstream. It's measured as grams of alcohol per 100 milliliters of blood. BAC determines your level of intoxication and legal ability to drive.
Your liver metabolizes alcohol at approximately 0.015% BAC per hour. This rate is relatively constant and cannot be significantly increased by coffee, cold showers, or exercise. Only time reduces BAC.
BAC is affected by weight, gender, age, metabolism, food consumption, medications, and drinking rate. Women typically have higher BAC than men at the same alcohol intake due to lower body water content.
This calculator provides estimates based on general formulas and should NOT be used to determine if you are safe to drive or operate machinery. BAC can vary significantly based on individual factors not accounted for in this calculator.
Even if this calculator shows you are below the legal limit, you may still be impaired. The only safe BAC for driving is 0.00%. Always use alternative transportation if you have been drinking.
This tool is not a substitute for professional medical advice. If you or someone you know has alcohol poisoning symptoms or alcohol dependency issues, seek immediate medical attention.
Blood Alcohol Content (BAC) is the percentage of alcohol in your bloodstream. It's measured as grams of alcohol per 100 milliliters of blood (g/100mL or %). BAC can be measured directly through blood tests or estimated using breathalyzers, urine tests, or calculators based on drinks consumed, body weight, gender, and time elapsed.
BAC calculators provide estimates based on the Widmark formula and are typically accurate within ±0.02%. However, individual factors like metabolism, food intake, medications, and health conditions can affect actual BAC. For legal purposes, only official breathalyzer or blood tests are valid. Use calculators for educational purposes only.
In the United States, the legal BAC limit is 0.08% for drivers 21 and over, and 0.00%-0.02% for drivers under 21 (zero tolerance). Commercial drivers have a limit of 0.04%. Many countries have limits of 0.05% or lower. Some jurisdictions have lower limits (0.02%-0.05%) for all drivers. Always check local laws.
The average person metabolizes alcohol at approximately 0.015% BAC per hour. For example, if your BAC is 0.08%, it would take about 5-6 hours to reach zero. However, this varies based on liver function, body weight, gender, age, and other factors. Never drive until completely sober.
No. Only time can lower BAC. Your liver metabolizes alcohol at a fixed rate (about one standard drink per hour). Water, coffee, cold showers, or exercise do not speed up alcohol elimination. These may make you feel more alert but do not reduce actual BAC or impairment.