Your body eliminates alcohol at a fixed rate of about 0.015% BAC per hour, and nothing you do can speed that up. For most people, a single drink takes roughly one to two hours to fully metabolize, while a night of heavier drinking can take well into the next day. The exact timeline depends on how much you drank, your body size, your sex, and whether you ate beforehand.
How Your Body Processes Alcohol
Your liver does nearly all the work of breaking down alcohol, and it can only handle so much at a time. The average rate is a drop of 0.015% BAC per hour. That number is remarkably consistent from person to person because liver enzymes have a maximum processing speed that extra effort or willpower can’t change.
A standard drink in the United States contains 0.6 ounces (14 grams) of pure alcohol. That’s one 12-ounce beer at 5% ABV, one 5-ounce glass of wine at 12% ABV, or one 1.5-ounce shot of liquor at 40% ABV. Each of those raises most people’s BAC by roughly 0.02% to 0.03%, meaning a single standard drink clears your system in about one to two hours. But drinks poured at home or at a bar are often larger than a “standard” serving, so your actual intake per round may be higher than you think.
Realistic Timelines by Number of Drinks
The math is straightforward once you know your approximate peak BAC. If you had four standard drinks over two hours and your BAC peaked around 0.08% (the legal driving limit in most U.S. states), it would take roughly five to six hours from your last drink to reach 0.00%. That means if you stopped drinking at midnight, you likely wouldn’t be fully sober until 5 or 6 a.m.
At six drinks, a peak BAC might land around 0.12% or higher, putting your timeline at eight hours or more. A heavy night of eight to ten drinks could push your peak past 0.15%, meaning you could still have alcohol in your system 10 to 12 hours after your last drink. This is why people sometimes fail breathalyzer tests the morning after a night out.
These are estimates. Your actual BAC depends on how quickly you drank, your weight, and other individual factors. But the 0.015% per hour rate is the constant you can count on for a rough calculation.
Why Women Sober Up More Slowly
Biological sex creates a significant difference in how fast alcohol hits your bloodstream, and consequently how long it stays there. Men have highly active alcohol-processing enzymes in both their stomach and liver. The stomach enzymes alone can reduce alcohol absorption by about 30% before it ever reaches the bloodstream. Women produce almost none of these stomach enzymes, despite carrying the same gene for them. The result is that women absorb a larger percentage of the alcohol they drink, reach a higher peak BAC from the same number of drinks, and take longer to return to zero.
Women also tend to have a higher proportion of body fat and less body water than men of the same weight. Since alcohol dissolves in water, less water means a more concentrated BAC. Together, these factors mean a 140-pound woman who drinks the same amount as a 140-pound man will typically be impaired longer.
How Food Changes the Timeline
Eating before or while you drink slows the rate at which alcohol enters your bloodstream. Food in your stomach keeps the valve between your stomach and small intestine partially closed, which delays absorption. This doesn’t change how fast your liver processes alcohol once it’s in your blood, but it lowers your peak BAC, which means less total time before you hit zero.
Drinking on an empty stomach does the opposite. Alcohol passes quickly into the small intestine, gets absorbed rapidly, and your BAC spikes higher and faster. A higher peak means a longer wait to sober up, even though the hourly processing rate stays the same. If you’ve ever felt dramatically more drunk from the same number of drinks on an empty stomach, this is why.
Coffee, Cold Showers, and Other Myths
Coffee does not sober you up. According to the CDC, caffeine mixed with alcohol does not reduce alcohol’s effects on your body. What caffeine does is make you feel more alert, which can trick you into thinking you’re less impaired than you are. This is actually more dangerous than feeling tired and drunk, because it can lead you to drive or make decisions you wouldn’t otherwise make.
Cold showers, exercise, vomiting, and drinking water all fail to speed up alcohol metabolism for the same reason: your liver sets the pace, and none of these things make your liver work faster. Hydration helps with hangover symptoms like headache and dry mouth, and it’s worth doing for comfort. But it won’t lower your BAC any quicker. The only thing that eliminates alcohol from your body is time.
How to Estimate Your Own Timeline
You can get a rough sense of when you’ll be sober with some simple math. First, estimate your peak BAC. Online BAC calculators let you plug in your weight, sex, number of drinks, and drinking duration. Then divide your estimated BAC by 0.015 to get the approximate hours until you’re at zero.
For example, if a calculator estimates your BAC at 0.09% when you stop drinking, divide 0.09 by 0.015. That gives you six hours. If you stopped at 1 a.m., expect to reach 0.00% around 7 a.m. Keep in mind that “feeling fine” often happens before your BAC actually reaches zero. Impairment starts at BAC levels well below what most people can perceive, so your judgment about your own sobriety is not reliable.
If your plans the next day involve driving, operating machinery, or anything requiring sharp reflexes, build in extra time beyond what the math suggests. Individual variation is real, and the consequences of underestimating your BAC are serious.