BAC Calculator Chart | Blood Alcohol Content (BAC) Levels

By: William C. “Bubba” Head, 48-Year Veteran Atlanta DUI Lawyer and One of Four Board-Certified DUI Attorneys in GA

Before consuming alcohol and driving in Georgia (or anywhere else in the United States), it’s essential to understand the factors that influence your blood alcohol concentration (BAC), such as your weight, gender, drinking duration, and the alcohol content of your beverages. Throughout the United States, Blood alcohol content levels required to arrest someone for driving under the influence vary by age and driver classification.

In Georgia, the alcohol legal limits vary: 0.08% for drivers 21 and older, 0.02% for drivers under 21, and 0.04% for commercial drivers (CDL holders). Knowing your BAC before getting behind the wheel can help you avoid a DUI charge.

To stay informed and safe, use our accurate BAC calculator below to estimate your current blood alcohol level.

What is Blood Alcohol Concentration (BAC)?

Blood Alcohol Concentration (BAC) is a measurement of the amount of alcohol in a person’s bloodstream. This BAC number is expressed as a percentage; for example, a BAC of 0.08% means there are 0.08 grams of alcohol per 100 milliliters of blood.

Law enforcement uses BAC to determine whether a driver is impaired by alcohol. In most states, it is illegal to drive with a BAC of 0.08% or higher for drivers age 21 and over. In Georgia, if your BAC is above or at the legal alcohol limit for your age and license type, you can be arrested for DUI Per Se, meaning that your BAC alone was enough to charge you for driving under the influence.

The legal BAC limits in Georgia are: 0.08% for drivers over 21, 0.02% for drivers under 21 and 0.04% for CDL holders, or those drivers operating a Commercial Motor Vehicle.

How Much Alcohol is in a Standard Drink?

If you’re ever stopped on suspicion of DUI, one of the first things an officer will evaluate is your blood alcohol concentration, or BAC. But many people don’t realize how easily a “standard drink” can affect that number.

In the U.S., a standard drink contains about 14 grams of pure alcohol, but that amount varies greatly depending on what you’re drinking.

A regular 12-ounce beer typically holds about 5% alcohol by volume (ABV). Malt liquor is stronger; just 8 or 9 ounces can contain around 7% ABV. A five-ounce glass of wine often runs 12% ABV. And distilled spirits, like whiskey, vodka, or rum, can reach 40% ABV, with a single shot (1.5 ounces) counting as one standard drink.

Factors that Affect Your BAC

Several key factors influence your blood alcohol concentration (BAC):

• Quantity of alcohol ingested — The more alcohol you consume, the higher your BAC will be.
• Whether food was ingested before or during drinking — Consuming food slows the absorption of alcohol into the bloodstream.
• Lean body (muscle) mass — BAC is affected by body composition. This is estimated from a person’s weight and assumes a normal height-to-weight ratio.
• Time elapsed since drinking began — The time between when you started drinking and when your BAC is measured impacts your result. This is known as the elimination period, as the body gradually metabolizes and reduces BAC over time.
• Many people also search for a “BAC to zero chart,” but the time it takes for BAC to return to zero depends on individual metabolism and the average elimination rate of 0.015% per hour.

For example, if your estimated BAC is 0.167% and four hours have passed, you would subtract about 0.06%, resulting in an adjusted BAC of approximately 0.107%

Use Our Blood Alcohol Calculator

Many people wonder how to calculate BAC. Our calculator uses established formulas based on alcohol elimination rates, weight, gender, and drinking duration.

This drunk calculator provides an estimate of your blood alcohol content based on the number of standard drinks consumed, your body weight, and time elapsed.

How Our BAC Calculator Works

Many people wonder how to calculate BAC. Our calculator uses established formulas based on alcohol elimination rates, weight, gender, and drinking duration.

This drunk calculator provides an estimate of your blood alcohol content based on the number of standard drinks consumed, your body weight, and time elapsed.

BAC Chart: Average Blood Alcohol Levels by Weight and Drinks

The chart for blood alcohol level below provides a visual reference for how BAC may change based on body weight and the number of drinks. This blood alcohol content chart is a useful complement to the BAC calculator above.

A common question is: How many drinks does it take to reach 0.08? For many adults, two to three standard drinks consumed quickly may result in a BAC at or above the legal limit, but this can vary depending on body weight, gender, and drinking pace.

Legal BAC Limits in Georgia

Georgia DUI laws establish the legal BAC limit for different types of drivers: 0.08% for drivers 21 and older, 0.02% for drivers under 21, and 0.04% BAC for commercial drivers (CDL holders).

Many drivers ask, “What is 2 times over the legal limit of alcohol?” In Georgia, that would be approximately 0.16 BAC, which can result in more severe penalties and is viewed as an aggravating factor in DUI cases.

What Happens If You Are Pulled Over or Arrested for DUI in Georgia

Most people who drink alcohol and drive never check a blood alcohol content chart or an online BAC calculator to know their legal limit. Many people mistakenly believe they can judge whether they are “over the limit” based on how they feel. This false sense of confidence is one of the main reasons DUI arrests are so common.

When you are pulled over or stopped at a sobriety checkpoint in Georgia, and the officer suspects that you may be driving under the influence, you will be read an implied consent notice. Under Georgia law, all drivers are deemed to have given prior consent to chemical testing of their blood, breath, or urine for the purpose of determining BAC levels.

In Georgia, a BAC of 0.15 or higher is considered a high BAC and can trigger enhanced DUI penalties, including longer license suspension and possible mandatory jail time.

If you refuse to take the state-administered chemical test after a lawful arrest for DUI, Georgia’s implied consent laws authorize an immediate license suspension. A refusal to submit can also lead to harsher penalties in court. The United States Supreme Court has upheld the constitutionality of these implied consent laws in Birchfield v. North Dakota (2016), allowing states to impose civil or criminal penalties for refusal.

Searching for a Top Georgia DUI Lawyer

After being arrested for DUI in Georgia, the first thing to do is identify an expert on Georgia DUI law through top attorney ratings. Look at who is BEHIND the law firm, review each of the trial lawyers’ credentials, and check out the criminal defense attorney who leads the law office. Every experienced DUI lawyer in the law firm must have full command of DUI laws and possess training in all aspects of successfully challenging a driving under the influence criminal case.

Most people who drink alcohol and drive never check a blood alcohol content chart or an online BAC calculator chart when drinking to know their legal alcohol limit. Many people erroneously think that they can judge being “over the limit” by how they feel. That misjudgment is why DUI attorneys have such a lucrative business in the field of criminal defense.

DUI Legal Alcohol Limits in Other States

The legal alcohol limit in ALL fifty states and the District of Columbia for all adult drivers age 21 and over is 0.08%.

The legal BAC level for underage DUI varies slightly across America, from 0.00% to 0.02%. Only 15 states currently use 0.00% BAC for underage drivers. Many other states set 0.01% or 0.02% as their underage limit to accommodate the breathalyzer’s margin of error.

One blood alcohol concentration level that does not vary is the federal BAC level set for drivers of Commercial Motor Vehicles (CMV). The federal BAC limit for CDL drivers is 0.04 BAC.

Federal law also requires that any CDL driver found with even a trace of alcohol must be taken out of service for at least 24 hours. This is what’s known as an out-of-service order.

Implied consent laws and refusal penalties also vary by state. If arrested for driving under the influence, refusal to submit to the official state sobriety test (the alcohol breath test is the most common type of legal BAC test) will suspend or revoke the person’s driver’s license under implied consent laws in that state.

In about a dozen states (e.g., Hawaii, Wisconsin, Minnesota), a DUI refusal may also require jail time for refusing to submit to a state sobriety test under implied consent statutes. These statutes call for an arrested drunk driver to allow police to check the already-arrested driver’s BAC levels to see what the BAC level might be. A DWI-DUI “refusal” can lead to TOTAL license suspension or revocation (i.e., no work permit allowed), plus a fine plus jail time, or all three, in some states.

Arrested for DUI Due to Being Over the BAC Legal Limit? Call a Top Georgia DUI Attorney

If arrested for driving under the influence and being above your permissible legal blood alcohol level, you definitely need a top DUI lawyer. Not all lawyer ratings are the same, but we invite you to COMPARE our legal industry credentials to ANY other DUI law firm.

William C. “Bubba” Head, Larry Kohn, and Cory Yager are ready and trained to help you win your case. Their law office focuses on how to beat a DUI in court.

Their focus on DUI defense has been honed over 90 years of collective legal practice defending Georgia drivers accused of driving under the influence.

Atlanta DUI lawyer, William C. “Bubba” Head, is an expert in Georgia’s official alcohol breathalyzer, the Intoxilyzer 9000. He understands the science behind these breath test machines and knows their limitations and propensity to produce false or inaccurate test results, especially when in the hands of an untrained officer.

Another one of our DUI attorneys, Cory Yager, was an ex-Cobb County and Roswell police officer who administered the very same Standardized Field Sobriety Tests you were asked to take. He understands the strict instructions and protocols police must follow when giving those tests, and knows exactly how they aren’t always reliable indicators of alcohol impairment.

Our third DUI defense partner, Larry Kohn, has been in practice since 1996. Over that legal career, he has attained many peer-recognized awards and has over 570+ client reviews on AVVO.com

All three of our Atlanta DUI lawyers are co-authors of the book DUI lawyers use to prepare for driving under the influence cases in Georgia. So, who else would you want to represent you for your DUI?

High BAC levels obtained at the time of your DUI arrest can look hopeless. However, if a pre-trial suppression motion results in the exclusion of those blood alcohol content “numbers,” then we can help most people avoid DUI convictions by successfully excluding the state’s forensic breathalyzer or blood alcohol test results!

Call our DUI defense firm now at 404-567-5515 to schedule a FREE consultation with Bubba, Cory, or Larry and tell them all about your case.