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Blood Alcohol Content (BAC) measures the percentage of alcohol in the bloodstream. It is calculated using the Widmark formula, which accounts for body weight, sex, number of drinks, and time elapsed. A BAC of 0.08% is the legal driving limit in most US states.

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1. 1BAC = (drinks × 14g × 0.789) / (weight_kg × distribution_ratio × 1000) × 100
2. 2Distribution ratio (r): 0.68 for men, 0.55 for women (alcohol distributes into body water)
3. 3Subtract 0.015% per hour for alcohol metabolized by the liver
4. 41 standard drink = 14g pure alcohol = 12oz beer / 5oz wine / 1.5oz spirits

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