It really does not take as much to drink to put you at risk for a DUI charge as you might imagine. The Blood Alcohol Estimator below will give you a rough estimate of what your BAC was in a given circumstance. You'll need to know your weight and how much you drank in fluid ounces. This chart does not take into account the number of hours over which drinks were consumed or the percentage of alcohol in your drink:
If you've had something to drink, err on the side of caution when deciding whether to drive.
Blood Alcohol Estimator