Can you drive after one margarita? Legally, you might be under the limit; practically, you’re taking a real risk. A standard margarita contains close to two standard drinks’ worth of alcohol, which is enough to push smaller drinkers near or past the 0.08% blood alcohol threshold used in 49 states and over the 0.05% limit used in Utah.1NIAAA. Adult Operators of Noncommercial Motor Vehicles Even for larger drinkers who stay under the number, measurable driving impairment begins well below the legal line, and an officer can charge you with impaired driving at any BAC if your behavior on the road shows it.
One Margarita Is Almost Two Drinks
The classic recipe calls for about 2 ounces of tequila plus 1 ounce of triple sec or Cointreau, along with lime juice. That’s roughly 3 ounces of spirits in a single glass, giving the finished cocktail an alcohol concentration around 27%.
Compare that to what public health guidance actually counts as one drink. The National Institute on Alcohol Abuse and Alcoholism defines a standard drink as any beverage containing 0.6 fluid ounces of pure alcohol, roughly 12 ounces of regular beer, 5 ounces of wine, or a single 1.5-ounce shot of liquor.2NIAAA. What Is a Standard Drink By that measure, one margarita contains about 1.9 standard drinks.
Restaurant pours make this worse. Frozen margaritas and oversized glasses can hold three or more standard drinks in a single serving. So when you say “just one,” your body may be processing the equivalent of a double.
What One Margarita Does to Your BAC
Because a margarita is closer to two drinks than one, the BAC it produces surprises people. After one standard drink, a 160-pound man reaches an estimated BAC around 0.023%, and a 130-pound woman reaches about 0.036%. Scale those up for a full margarita, and a 160-pound man could land around 0.04% to 0.05%, while a 130-pound woman could reach 0.06% to 0.07%. That’s already over the limit in Utah and knocking on the 0.08% door everywhere else.
Lighter drinkers see steeper numbers. A 120-pound woman could exceed 0.07% from a single margarita, a zone where driving impairment is documented and a traffic stop can easily end in charges. These figures are estimates, not guarantees. The only way to know your actual number is a calibrated breath or blood test.
Impairment Starts Before the Legal Limit
Alcohol’s effect on driving begins far below the level most people would call drunk. At a BAC of just 0.02%, tracking a moving object and dividing attention between two tasks, like watching the road while checking a mirror, both measurably decline.3Green River College. Effects of Blood Alcohol Concentration One study found hand-eye coordination dropped more than 20% at a BAC of 0.015%, equivalent to less than half a beer for a 165-pound person.4ScienceDaily. Blood Alcohol Levels Much Lower Than the Legal Limit Impair Hand-Eye Coordination
By 0.05% BAC, where many margarita drinkers land, reduced coordination, difficulty steering, and slower reaction to emergencies are all documented. And alcohol reduces your ability to notice these deficits. You feel fine while your reaction time tells another story. That’s where a lot of one-drink DUI cases start: not someone who felt wasted, but someone who genuinely thought they were okay.
The Legal Limit, and Why Being Under It Isn’t a Free Pass
As of 2025, 49 states and the District of Columbia set the per se legal BAC limit at 0.08% for drivers 21 and older. Utah alone uses 0.05%.1NIAAA. Adult Operators of Noncommercial Motor Vehicles
“Per se” means that at or above the limit, the law treats you as intoxicated regardless of how you felt or how you drove. But hitting the number isn’t a prerequisite for arrest. Every state also recognizes an impairment-based DUI, so an officer who sees erratic driving, slurred speech, or poor field sobriety performance can charge you at any BAC. One margarita can leave you legally impaired without ever crossing 0.08%.
If You Drive Commercially
Hold a commercial driver’s license and the limit drops to 0.04% BAC, on or off duty.5eCFR. 49 CFR 382.201 – Alcohol Concentration A single margarita can put a CDL holder over that line easily. A conviction disqualifies you from operating a commercial vehicle for at least one year.6FMCSA. Is a Driver Disqualified for Driving a CMV While Off-Duty With a Blood Alcohol Concentration Over 0.04 Percent
If You’re Under 21
Every state enforces zero-tolerance laws for underage drivers. Most set the trigger at 0.02%; some at 0.00% or 0.01%.1NIAAA. Adult Operators of Noncommercial Motor Vehicles A few sips of a margarita can put you over. Penalties typically include license suspension and fines.
What Shifts Your Personal Number
Two people can drink the exact same margarita and end up with meaningfully different BACs. The main variables:
- Body weight. A heavier person has more blood and body water to dilute alcohol. A 200-pound man reaches a BAC roughly 40% lower than a 130-pound man from the same drink.
- Biological sex. Women generally have proportionally more body fat and less body water than men at similar weights, so alcohol concentrates more in the bloodstream. A woman and a man of the same weight sharing the same margarita will typically see different readings, with hers higher.7NIH. Gender Differences in Moderate Drinking Effects
- Food in your stomach. Eating before or during drinking slows absorption. On an empty stomach, alcohol enters the bloodstream faster and peaks higher.
- Drink strength and speed. A margarita gulped in ten minutes hits harder than one sipped over an hour. A generous restaurant pour delivers more alcohol than a measured home recipe.
Your body clears alcohol at a roughly fixed rate of about 0.015% BAC per hour, which works out to about one standard drink per hour for most adults. Because a margarita is closer to two drinks, expect at least two hours before your BAC returns to zero, and longer if you’re smaller or drank on an empty stomach. Coffee, food, water, and cold showers do nothing to speed this up. Only time.
If You Get Pulled Over
Every state has an implied consent law. By driving on public roads, you have already agreed to submit to a chemical BAC test if lawfully arrested on suspicion of impaired driving. Refusing does not protect you. In all states except Wyoming, refusal triggers separate administrative penalties, most often an automatic license suspension that’s often longer than what you’d face for the DUI itself. In at least 12 states, refusal is a standalone criminal offense on top of the DUI charge.8NHTSA. BAC Test Refusal Penalties
If you’re stopped after a margarita, refusing the test usually makes the situation worse, not better.
What Getting It Wrong Costs
A first-offense DUI conviction routinely runs $10,000 to $25,000 once you add up towing, bail, court fines, attorney fees, mandatory alcohol education, license reinstatement, and insurance. Statutory fines for a first offense range from a few hundred dollars to $10,000 depending on the state. Private defense attorneys typically charge from a few thousand for a straightforward plea to $10,000 or more for a contested case.
Insurance is where the damage compounds. After a DUI, auto premiums jump by an average of about 92%, and the surcharge sticks around for three to five years in most states. Many states also require an SR-22 filing, which is proof of minimum liability coverage sent by your insurer directly to the state. In roughly two-thirds of states, even first-time offenders must install an ignition interlock device: about $70 to $150 to install, plus $60 to $80 a month for as long as the court requires.9National Conference of State Legislatures. State Ignition Interlock Laws
And a DUI is a criminal record. It shows up on standard background checks for seven to ten years in most states, and some keep the record indefinitely.
The Safer Play
The only fully reliable way to eliminate the risk is not to drive. Line up a sober driver before you order. Rideshares and taxis are cheaper than any of the numbers above. If you’re already at the restaurant and realize the drink was stronger than you planned, waiting works, but only if you wait long enough: at least two hours from your last sip for a standard margarita, longer if you’re smaller or drank on an empty stomach.
Personal breathalyzers cost under $50 and can give you a rough read, though they’re less precise than police devices and should be treated as a safety check, not a green light. A $20 rideshare against a potential $10,000 to $25,000 DUI is not a close call.