Blood Alcohol Content (BAC) Estimator
Estimate Blood Alcohol Content using the Widmark formula. For education only — do not drive based on this estimate. Many factors affect real BAC.
Inputs
1 std drink = 12 oz beer (5%), 5 oz wine (12%), 1.5 oz spirits (40%)
Estimated BAC
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Impairment level
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Time until 0.00 BAC
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Time until under 0.08
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Alcohol consumed
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About Blood Alcohol Content (BAC) Estimator
How accurate is this?
Widmark estimates can be off by ±20-40%. Real BAC depends on food, hydration, body composition, medications, and individual liver function. Do not rely on calculators to decide if you can drive.
Standard drink definition
US: 14 grams pure alcohol = 12oz beer (5%), 5oz wine (12%), 1.5oz spirits (40%). UK uses 8g/unit; Europe 10g. Cocktails often contain 2-3 standard drinks.
Metabolism rate
The liver metabolizes alcohol at ~0.015% BAC per hour, regardless of how much you\u2019ve had. Nothing speeds this up — not coffee, water, food, or exercise.