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Blood/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.

Using the BAC calculator

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

  • Keep in mind the results generated are estimates.
  • The primary purpose is to provide information about the responsible use of alcohol.

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

Weight: (pounds)
Drinks consumed: (12 oz. beer or equivalent)
Over time period: (hours)
Gender:

Your BAC will be:

Disclaimer

For more information on BAC rates and how to calculate, click here to see the BAC charts.