What is your B.A.C.?

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.

• Tennessee defines illegal intoxication for purposes of driving as having a BAC of 0.08 or greater, in most cases. But alcohol will affect driving skills at BACs of 0.05 or even lower.
• Driving skills, especially judgment, are impaired in most people long before they show signs of drunkenness. The public usually associates BAC with "drunk driving." But it's more accurate to refer to "alcohol-impaired" driving because you do not have to be "drunk" to be impaired in your ability to safely drive a car.