Montana Department of Transportation

Blood Alcohol Level (BAC)

BAC apps are available for most smart phones. We suggest using them before you take your first drink to see how little it takes to be impaired. It's pretty sobering. And it will remind you to either keep your drinks to a minimum or plan for a safe ride, right up front.

All states have passed a .08 DUI per se law. Due to the number of factors that come into play regarding the consumption and reduction (burnoff) rates of different people, no blood alcohol content (BAC) calculator is 100% accurate. Some users may become intoxicated at a much lower BAC level than is indicated. Portion sizes may be larger than the standard drink size. This is in no way purported to be a guideline for how much you can drink and still drive to avoid being arrested! The best policy is NEVER drink and drive.