BAC Calculator (Blood Alcohol)
Estimate your Blood Alcohol Concentration (BAC) using the Widmark formula. Enter your gender, body weight, number of standard drinks, and hours since your first drink.
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About Blood Alcohol Concentration
Blood Alcohol Concentration (BAC) measures the amount of alcohol in your bloodstream as a percentage. It is affected by factors including body weight, gender, the amount and type of alcohol consumed, and time elapsed since drinking. This calculator provides estimates only.
Standard Drink Equivalents
- Beer (5%): 12 oz / 355 ml
- Wine (12%): 5 oz / 148 ml
- Spirits (40%): 1.5 oz / 44 ml
- Each equals approximately 14 grams of pure alcohol
BAC Levels and Effects
- 0.02%: Slight mood changes, relaxation
- 0.05%: Lowered inhibitions, impaired judgment
- 0.08%: Legal limit in most US states (impaired driving)
- 0.15%: Significant impairment, possible vomiting
- 0.30%+: Risk of loss of consciousness, medical emergency
Disclaimer: This calculator provides estimates only. Actual BAC varies based on many factors including metabolism, food intake, medication, and individual tolerance. Never rely on a calculator to determine if you are safe to drive. When in doubt, do not drive.