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Glossary Health & Fitness

Blood alcohol content (BAC)

Blood alcohol content is the percentage of alcohol in the blood; the Widmark formula estimates it from drinks, body weight and time.

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In more detail

For an 80 kg man after 3 standard drinks (14 g of alcohol each) and 2 hours, the estimate is about 0.047%. Real BAC varies with food, metabolism and body composition; never use an estimate to decide whether to drive.

Try these tools

BAC Calculator

Estimate your blood alcohol concentration (BAC) using the Widmark formula.

Alcohol Units Calculator

Add your usual drinks to see UK alcohol units, US standard drinks, grams of pure alcohol and calories per week.

See also

  • Glossary Calorie
    A calorie, as used for food, is a kilocalorie (kcal): the energy to raise 1 kg of water by about 1 °C, equal to 4.184 kilojoules.
  • Cheat sheet Medical Formulas Cheat Sheet
    A1C to glucose, blood pressure bands, cholesterol, kidney function, QTc, blood alcohol and IV drip rate with worked examples.
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