One standard drink takes roughly one hour to fully leave your system. Your liver processes alcohol at a near-fixed rate, and nothing you do can meaningfully speed that up. The actual time can range from about 45 minutes to well over an hour depending on your body size, sex, and whether you ate beforehand.
What Counts as One Drink
In the United States, one standard drink contains 0.6 ounces (14 grams) of pure alcohol. That’s 12 ounces of beer at 5% alcohol, 5 ounces of wine at 12%, or a 1.5-ounce shot of 80-proof liquor. A craft IPA at 8% or a generous restaurant pour of wine can easily count as one and a half or two standard drinks, which changes your timeline significantly.
Your BAC After One Drink
One drink raises your blood alcohol concentration (BAC) by different amounts depending on your weight and sex. A 180-pound man will hit roughly .021 BAC from a single drink. A 140-pound woman will reach about .033 from that same drink. The difference is substantial: a smaller person starts higher and takes longer to get back to zero.
Women generally reach a higher BAC than men of the same weight for a biological reason beyond body size. Men produce a stomach enzyme that breaks down about 30% of alcohol before it ever reaches the bloodstream. Women’s bodies don’t activate this enzyme, so more alcohol passes directly into the blood.
Food matters too. These BAC numbers assume an empty stomach. Eating before or while drinking slows alcohol absorption and typically results in a lower peak BAC.
How Your Body Processes Alcohol
Your liver does nearly all the work. It converts alcohol into a toxic intermediate compound, then quickly converts that into a harmless substance (acetate), which your body eventually turns into carbon dioxide and water. This is a two-step chemical process, and it runs at a roughly constant speed regardless of how much you wish it would go faster.
The average person eliminates alcohol at a rate of .015 to .020 BAC per hour. For men, the average is closer to .015 per hour. For women, it’s slightly higher at about .018 per hour. So if you’re a 150-pound man at .025 BAC after one drink, you’re looking at about an hour and 40 minutes to reach zero. A 130-pound woman at .036 would need roughly two hours.
Why Body Size and Sex Change the Timeline
Here’s a practical breakdown of approximate time to zero BAC after one standard drink on an empty stomach:
- 200-pound man (.019 BAC): about 1 hour 15 minutes
- 160-pound man (.023 BAC): about 1 hour 30 minutes
- 130-pound man (.029 BAC): about 2 hours
- 160-pound woman (.028 BAC): about 1 hour 35 minutes
- 130-pound woman (.036 BAC): about 2 hours
- 110-pound woman (.042 BAC): about 2 hours 20 minutes
These are estimates. Individual variation in liver enzyme activity, genetics, age, and overall health can shift the number in either direction. But the ballpark holds: one drink takes somewhere between one and two and a half hours to fully clear, with most people falling around the one-hour mark for a person of average size.
Nothing Speeds Up the Process
Coffee, cold showers, fresh air, exercise, energy drinks: none of these change how fast your liver works. Your body eliminates alcohol on a fixed schedule. Caffeine can make you feel more alert, which may create the illusion of sobriety, but your BAC stays exactly the same. A cold shower makes sobering up a cleaner experience, as the Hazelden Betty Ford Foundation puts it, but it has no effect on your blood alcohol level.
Drinking water is still a good idea. Alcohol causes your body to flush out water faster than it processes the alcohol itself, which contributes to dehydration and hangover symptoms. Staying hydrated won’t help you sober up faster, but it can reduce the headache and fatigue that come afterward.
Feeling Sober vs. Being Sober
One drink produces relatively mild effects in most people, which is part of what makes this question tricky. You might feel completely normal 30 minutes after finishing a beer, but your BAC is still above zero. For most daily activities this doesn’t matter much, but for driving it can. Even low BAC levels below the legal limit of .08 can slightly slow reaction time and affect judgment.
Breathalyzer tests can detect alcohol long after you feel fine. While one drink is typically undetectable within a couple of hours, individual variation means some people may show trace amounts for longer. If you’re concerned about a specific situation like a workplace test or driving, the safest math is to count one full hour per standard drink from the time you stop drinking, then add a buffer.
The Practical Takeaway
For most adults of average weight, one standard drink clears your system in roughly 60 to 90 minutes. If you’re smaller, female, or drank on an empty stomach, budget closer to two hours. The only variable you can control before drinking is eating a meal, which lowers your peak BAC. Once the alcohol is in your bloodstream, time is the only thing that brings it back down.