DUI vs. DWI: What Is the Difference and What Do the Charges Actually Mean

DUI and DWI both refer to a state-defined impaired-driving offense involving alcohol or drugs. In many states, the terms are used interchangeably and describe the exact same charge. In others, they are two separate offenses with different BAC (blood alcohol concentration) thresholds or penalties — and which one is more serious depends entirely on the state.

What that looks like varies by where you live, the BAC at the time of the stop, and a handful of circumstances that can escalate either charge. 

DWI vs. DUI: The Basic Distinction

Where both terms exist as separate charges, DWI (driving while intoxicated) is typically the more serious one, applied to a higher BAC or specific aggravating circumstances. DUI (driving under the influence) is often the lesser charge, applying to lower BAC levels or to younger drivers. In states that use both terms, the difference is usually statutory and not a different underlying behavior. In many other states, the two terms describe exactly the same offense under one label. Which pattern applies depends entirely on your state's law.

What both charges share is the legal foundation beneath them: a per se BAC threshold. Per se means the law does not require visible signs of impairment at the time of the stop. If a chemical test shows your BAC at or above the statutory limit, a charge can be filed on that number alone. The driver does not need to have failed a field sobriety test or shown erratic behavior.

That per se threshold is 0.08% for drivers 21 and older in every state. Whether the resulting charge is called a DUI, a DWI, or something else entirely is a naming decision each state makes independently.

States That Use Both Terms and How They Differ

When a state uses both DUI and DWI as separate charges, the ranking between them is not consistent from state to state. The same term can represent the more serious charge in one jurisdiction and the lesser one in another. DUI laws by state vary more on this point than most people expect.

Texas separates the charges by driver age. DWI generally applies to drivers 21 and older with a BAC of 0.08% or above. DUI in Texas applies specifically to drivers under 21 who have any detectable amount of alcohol in their system. In Texas, DUI is the lesser charge and is reserved for underage drivers.

New York uses a third term. DWI is the primary charge for a blood alcohol content (BAC) of 0.08% or above. DWAI (Driving While Ability Impaired) is the lesser offense, applying to a BAC of 0.05% to 0.07%. DWAI reflects a measurable level of alcohol that falls below New York's 0.08% per se threshold.

Maryland works differently from Texas. There, DWI is generally the lesser charge and DUI is the more serious one. A DWI in Maryland typically corresponds to a lower BAC or less evidence of impairment. DUI is the charge when higher impairment or a higher BAC is present.

These examples are representative, not exhaustive. State laws change, and the specifics of any charge depend on current statute in the relevant jurisdiction.

In many states that use both labels, the distinction is often based on BAC level, driver age, or another statutory threshold. The underlying act is the same in every case. The label tells you where on the severity scale the charge falls.

States That Use Only One Term

In many states, the DUI vs DWI question does not come up because the law uses a single term for all impaired-driving offenses. Whether a driver is just over the per se limit or significantly above it, the charge has one name.

California commonly uses DUI as the label for impaired-driving offenses. Every impaired-driving charge in the state, regardless of BAC level, substance involved, or other circumstances, falls under the DUI label. There is no DWI charge in California law to compare it against.

Illinois follows the same approach. A driver charged with impaired driving in Illinois faces a DUI regardless of the specifics of the stop. DWI does not exist as a separate category.

The statutory label can differ by state, but the BAC threshold often remains similar for standard adult drivers.

Roughly 10 to 12 states use DWI as their primary or only term. The majority use DUI. In either case, the offense is the same act.

The BAC Thresholds That Trigger Each Charge

The DUI BAC limit most people know is 0.08%. That is the per se threshold in every state except Utah for standard adult drivers 21 and older. At 0.08% or above, a charge can be filed on the BAC number alone, without additional evidence of impairment. This standard applies whether the charge is called a DUI, a DWI, or something else. 

Two other driver categories face lower limits.

Commercial drivers (CDL holders) are held to a 0.04% BAC limit in any vehicle, personal or commercial. That is half the standard threshold. A CDL holder driving their own car is subject to the same 0.04% limit as when they are operating a commercial vehicle.

Many states use zero-tolerance rules for drivers under 21, often at 0.02% BAC or lower. The 0.02% level is low enough that a single drink can put a younger driver there, which is effectively the intent of the law.

Utah was the first state to lower its adult per se limit to 0.05%, and it remains the only state below 0.08% for standard adult drivers as of 2026. Several other states have considered similar legislation. The 0.08% threshold remains the law everywhere else.

Other Factors That Change the Charge

BAC level is the primary variable in most impaired-driving cases, but several other circumstances can escalate a charge regardless of where the BAC lands.

Many states add an aggravated or extreme DUI category for drivers significantly above the per se limit. The common cutoff points are 0.15% and 0.16% BAC. A charge at that level typically carries heavier mandatory penalties than a standard first offense.

Prior convictions change the picture as well. Repeat offenses can trigger harsher penalties, and in some states may be charged as felonies. Many states attach mandatory minimum sentences starting with a second charge.

Whether an accident or injury occurred matters too. An impaired-driving stop that results in property damage, bodily injury to another person, or a fatality carries consequences well beyond those of a traffic stop with no incident.

Many states treat a minor passenger as an aggravating factor, often resulting in additional charges on top of the primary offense.

CDL holders face a separate consideration beyond the lower 0.04% threshold. The career consequences of a DUI conviction for someone who drives professionally can be severe and long-lasting, regardless of which vehicle they were operating at the time. 

What Knowing Your Number Means

Most impaired-driving charges involve drivers who genuinely believed they were under the limit. Guessing what your number might be is precisely where the risk lives. A BACtrack breathalyzer gives you an actual breath test reading in seconds, so the number stops being a guess. BAC is not something anyone can estimate reliably by how they feel. Weight, food intake, how quickly drinks were consumed, and the type of alcohol all affect the number, and the perception of impairment often lags behind where the BAC actually lands.

Having an actual breathalyzer test reading before you drive is the only way to take the guesswork out of it. Find a BACtrack breathalyzer that fits your needs.

Frequently Asked Questions

What is the difference between DUI and DWI?

DUI is a charge label, not a BAC level in itself. Whether a specific BAC triggers a DUI depends on what your state calls the offense. In states that use DUI as their primary impaired-driving charge, the per se threshold for standard adult drivers 21 and older is typically 0.08%. Commercial drivers face a lower limit of 0.04%. Many states apply zero-tolerance rules for drivers under 21, often at 0.02% BAC or lower. 

What BAC level is a DUI?

For standard drivers 21 and older, the per se threshold in all 50 states is 0.08%. That is the DUI BAC limit that applies regardless of what the charge is called in your state. Commercial drivers (CDL holders) face a lower limit of 0.04%. Drivers under 21 face zero-tolerance laws in most states, with the threshold set at 0.02% BAC or lower.

Is a DUI a felony or misdemeanor?

A first offense is typically a misdemeanor. A DUI can rise to a felony with possible jail time when the driver has prior convictions, when the incident caused injury or death, or when the BAC was significantly above the per se limit. Exact rules vary by state, and some states automatically elevate a second or third offense to felony status regardless of other factors.

What states use DWI instead of DUI?

Some states use DWI as their primary or only term, while others use DUI. A smaller number use both as separate charges with different thresholds or penalties. Texas, New Jersey, and Minnesota are among the states that use DWI terminology, though the specifics of how each state defines and applies the charge vary. State laws change, so checking current statute in the relevant jurisdiction is the most reliable approach. 

What happens when you get a first DUI?

Penalties for a first offense typically vary by state, but a first DUI is commonly charged as a misdemeanor. Consequences may include driver’s license suspension, fines, mandatory alcohol education classes, and in some states an ignition interlock device requirement. The specifics depend on state law and on whether an accident or injury occurred. For CDL holders, the professional consequences of a first DUI can be severe regardless of which vehicle was involved. 

Can a first drunk driving charge include jail time, probation, or community service?

It depends on the state. A first drunk driving charge is commonly a misdemeanor, but the penalties attached to it vary widely. Some states impose mandatory minimum jail time even for a first offense. Others allow a judge to substitute probation, community service, or a combination of both in place of incarceration. A criminal defense attorney can help clarify what the likely range of outcomes looks like under the specific statute in your state and whether any circumstances of the stop, such as BAC level or whether an accident occurred, are likely to affect sentencing.

References

1. NHTSA. Impaired Driving. National Highway Traffic Safety Administration. Accessed June 2026.
2. FMCSA. 49 CFR 382.201. Prohibition. FMCSA. Accessed June 2026.
3. Utah Code Ann. Title 41, Chapter 6a, Section 502. Driving Under the Influence. Utah State Legislature. Accessed June 2026.