Your body eliminates alcohol at a fixed rate of about 0.015 BAC per hour, which works out to roughly one standard drink every 60 minutes. That means if you stop drinking at a BAC of 0.08 (the legal limit in most U.S. states), it will take about five and a half hours to reach 0.00. A heavier night of drinking that pushes your BAC to 0.15 could take ten hours or more to fully clear.
How Your Body Processes Alcohol
Almost all the alcohol you drink is broken down in the liver by an enzyme called alcohol dehydrogenase. This enzyme converts alcohol into a toxic byproduct called acetaldehyde, which is then quickly broken down again into acetate, and eventually into water and carbon dioxide that your body can easily get rid of. The problem is that this system has a speed limit. Your liver can only process so much at once, and no amount of water, food, or willpower speeds it up.
That speed limit is consistently about 0.015 grams per 100 milliliters of blood per hour. In practical terms, your BAC drops by 0.015 every hour. One standard drink in the U.S. contains about 14 grams of pure alcohol, whether that’s a 12-ounce beer at 5% ABV, a 5-ounce glass of wine at 12%, or a 1.5-ounce shot of liquor at 40%. Your body needs approximately one hour to process each of those servings.
Estimated Sobering Times by BAC
Since the elimination rate is essentially constant, you can estimate your timeline based on how high your BAC climbs during a drinking session:
- BAC of 0.04 (1 to 2 drinks for most people): about 2.5 to 3 hours to reach 0.00
- BAC of 0.08 (legal limit): about 5 to 5.5 hours
- BAC of 0.12 (moderately intoxicated): about 8 hours
- BAC of 0.15 (significantly impaired): about 10 hours
- BAC of 0.20 or higher (heavily intoxicated): 13 hours or more
These estimates assume you’ve stopped drinking and are counting from your last sip. Keep in mind that your BAC can continue to rise for 30 to 45 minutes after your final drink as alcohol finishes absorbing into your bloodstream. So if you feel fine immediately after putting down your glass, you may not yet be at your peak level.
Why Some People Sober Up Slower
The 0.015-per-hour rate is an average. Several biological factors push that number higher or lower for different people.
Sex plays a significant role. Women generally reach higher BAC levels from the same amount of alcohol, in part because of a key difference in stomach enzymes. Men actively produce an enzyme in the stomach lining that breaks down roughly 30% of alcohol before it ever reaches the bloodstream. In women, the gene for this enzyme is essentially switched off, meaning more alcohol passes directly into the blood. The result is that women typically get intoxicated faster and stay intoxicated longer from the same number of drinks.
Body weight and composition matter too. A larger person with more body water will dilute the same amount of alcohol across a bigger volume, resulting in a lower peak BAC. Someone who weighs 140 pounds will reach a noticeably higher BAC than someone who weighs 200 pounds after the same three drinks, and will therefore need more time to return to zero.
Liver health is another major factor. Chronic heavy drinking, liver disease, and certain medications can impair your liver’s ability to produce the enzymes needed to break alcohol down efficiently. If your liver is already working hard to process other substances, alcohol clearance slows. Age also reduces metabolic efficiency over time, so older adults generally process alcohol more slowly than younger ones.
Coffee, Cold Showers, and Other Myths
There is no shortcut. Coffee does not sober you up. The CDC is clear on this point: caffeine does not reduce the effects of alcohol on your body. It can make you feel more alert, which creates a dangerous illusion of sobriety, but your BAC and your actual impairment remain unchanged. You’re simply a wide-awake drunk person instead of a sleepy one.
Cold showers, exercise, eating food after drinking, and “sweating it out” are equally ineffective at speeding up alcohol metabolism. Your liver works at its own pace regardless of what the rest of your body is doing. The only thing that reliably lowers your BAC is time.
How Long Alcohol Shows Up on Tests
Even after you feel sober, alcohol or its byproducts can remain detectable in your system. A standard blood alcohol test can detect alcohol for up to about 12 hours after your last drink. Breathalyzer tests work on a similar timeline since they’re measuring alcohol vapor from your blood as it passes through your lungs.
Urine tests have a wider detection window. Standard urine screens pick up recent use within a day or so, but specialized tests that look for alcohol metabolites (rather than alcohol itself) can detect drinking for 48 to 80 hours after your last drink. These are the tests commonly used in workplace screening, court-ordered monitoring, and treatment programs. If you’re facing a test with real consequences, the safest assumption is that any drinking within the past three days could show up.
Sobering Up vs. Withdrawal
For someone who had a few drinks on a night out, “getting sober” simply means waiting for your body to clear the alcohol. You might feel tired, slightly nauseated, or foggy the next morning, but that’s a hangover, not withdrawal.
Withdrawal is a different and far more serious process that affects people who have been drinking heavily and regularly over weeks, months, or years. When someone in that situation stops drinking, withdrawal symptoms typically begin within 6 to 24 hours. Early symptoms include anxiety, tremors, sweating, nausea, and insomnia. In severe cases, withdrawal can progress to seizures or a dangerous condition called delirium tremens, which can be life-threatening without medical supervision.
The distinction matters because the question “how long does it take to get sober” means very different things depending on your situation. If you’re waiting to drive home after a party, the answer is measured in hours and depends on your BAC. If you’re trying to quit after a period of heavy daily drinking, the acute withdrawal phase typically lasts 2 to 7 days, and the full adjustment period can stretch weeks or months as your brain chemistry recalibrates.
Practical Planning
If you’re trying to figure out when you’ll be safe to drive after a night of drinking, the most reliable approach is to count your drinks, estimate your peak BAC, and then allow one hour for every 0.015 of BAC you need to eliminate. For most people, that means if you had four or five drinks and stopped at midnight, you likely won’t be at 0.00 until well into the next morning.
A common mistake is assuming you’re fine because you slept for six or seven hours. Sleep does not speed up metabolism. It just makes the wait less boring. If you went to bed at a high BAC, you may wake up still legally impaired even if you feel mostly functional. The residual effects of alcohol on coordination and reaction time can linger even as your BAC approaches zero, which is why many alcohol-related traffic incidents happen the morning after heavy drinking rather than during the night itself.