Anything beyond .08 puts you in danger zone.
A warning to everyone: the popular notion that if your BAC is under .08 you are "safe" from a DUI conviction is wrong in at least most states. In most states, the DUI statute has two parts to it.
One part of it says that you are guilty if you operate a motor vehicle with a BAC of .08 or more. Under that part, the state does not have to prove intoxication, i.e. that your ability to drive was impaired. All it has to prove is that you operated a motor vehicle and your BAC was .08 or more.
The other part of the DUI statute makes it illegal to operate a motor vehicle with any amount of alcohol or drugs in your system if you are intoxicated. In order to make its case under this part, the state needs to prove the alcohol impaired your ability to drive. If you were driving erratically, you fail the field sobriety test, or there is any other indication that you are adversely affected by the alcohol that may be enough to for the state to win conviction under this part.
As you can see, having a BAC of .08 or more makes the state's case easier because it doesn't have to prove impairment/intoxication. But even if you are under .08 BAC, the state can still make a DUI charge stick if it can show the impairment. This is the part that most people don't seem to know.
Thus, if you have ANY amount to drink and then drive, you run a risk that you might end up with a DUI arrest and conviction. Of course, the more you drink, the higher the risk is. But don't get in the car after drinking with the false notion that if you are under .08 you are safe from a DUI charge.