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Breath Alcohol Concentration (BAC) Calculator

Blood-Breath Alcohol Concentration (BAC) is the amount of alcohol in the bloodstream or on one's breath. BAC is expressed as the weight of ethanol, measured in grams, in 100 milliliters of blood, or 210 liters of breath. BAC can be measured by breath, blood, or urine tests.

Use this calculator to instantly compute your estimated blood/breath alcohol concentration.

NoteNote: the results generated are estimates. The purpose is to provide information about the responsible use of alcohol.

Instructions: Please select drinks consumed, time period, gender, and weight then click the "Calculate your BAC" button:

  • Drinks consumed:
     - 12 oz. beer or equivalent;
  • Over time period:
     - Hours
  • Gender:
     - Male / Female
  • Weight:
     - Pounds
  • Breath Alcohol Concentration (BAC) will be:


Your actual Breath Alcohol Concentration (BAC) is dependent on many complex factors, including your emotional and physical condition and health, and what you've recently ingested (including food, water, medications and other drugs).

What can affect your Breath Alcohol Concentration (BAC)?

  1. How much alcohol you drink.
  2. How fast you drink, time period. In general, the quicker you drink, the higher your peak BAC will be.
  3. Your weight. Large people tend to reach lower BACs than smaller people, given the same amount of alcohol.
  4. Food. When there is food in your stomach, alcohol is absorbed more slowly into the blood stream.
  5. Gender. Women reach higher BACs faster because they have less water in their bodies and more adipose tissue (fat), which is not easily penetrated by alcohol. A man and a woman, with all other factors being equal, both drinking the same amount of alcohol, will have different BAC levels. Woman's BAC will be higher.

You should not consider this to be a guideline for how much you can drink and still drive responsibly, or avoid being arrested!

The best policy is DON'T DRINK AND DRIVE.

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