Blood/Breath Alcohol Content
This calculator is designed to estimate your blood/breath alcohol concentration. Its primary purpose is to provide useful information about the responsible use of alcohol.
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.
In the United States, the legal limit is 0.08 percent. If your blood has more than 0.08 percent alcohol concentration, you’re legally intoxicated. However, concentrations of 0.05 percent or lower can affect your ability to safely drive a vehicle.