Blood Alcohol Concentration (BAC) Calculator

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One standard drink = 14 g alcohol (e.g. 12 oz 5% beer, 5 oz wine, 1.5 oz 80-proof spirit). Estimate only; do not use for legal or driving decisions.

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About BAC

Blood alcohol concentration (BAC) is the amount of alcohol in your bloodstream. Legal limits for driving are typically 0.08% in the US. This calculator is for education and planning only; it is not legally or medically authoritative. Do not drive after drinking.