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A good driver means:

Have no accidents or violations in the last 3 years.

Don't have a DUI.

Don't need an SR22.

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Use this calculator to see how your drinking during a night out affects your blood-alcohol level, and how that compares to the DUI limit according to your state's laws.

Using BAC Calculator

This calculator takes into account your weight, gender, the time you'll be out, drinks you'll consume, and state laws to determine how you can stay under the DUI limit. Please keep in mind, however, that you should always take precautions before getting behind the wheel to protect the safety of yourself and others. People are affected by alcohol differently, and it may be unsafe for you to drive even if you're under your state's DUI limits.

Blood Alcohol Content Calculator

A person's blood-alcohol level is the result of a complex interaction of weight, gender, alcohol consumed, and time.
WEIGHT
DRINKS CONSUMED
OVER TIME PERIOD

The basic formula for estimating a person's blood-alcohol concentration comes from The National Highway Traffic Safety Administration. Each drink in this calculation assumes a volume of .54 ounces of alcohol (one shot of distilled spirits, a glass of wine, or 12 ounces of beer).

Understand your limits & the consequences

If you feel safe driving after a few drinks, also keep in mind that the most routine DUI conviction is guaranteed to cost you thousands of dollars and mar your record for years. And it will drive up your car insurance rates for just as long.