Your body eliminates alcohol at a roughly fixed rate: most people lower their blood alcohol concentration (BAC) by about 0.015 per hour. That means if you stop drinking at a BAC of 0.08 (the legal limit in most U.S. states), it takes around five to six hours to reach 0.00. A heavier night of drinking that pushes your BAC to 0.15 or higher could mean 10 or more hours before you’re truly sober.
The frustrating truth is that nothing speeds this process up. Not coffee, not a cold shower, not food after the fact. Your liver works on its own schedule, and understanding that schedule is the only reliable way to estimate when you’ll be sober.
How Your Body Processes Alcohol
When you drink, about 20 percent of the alcohol absorbs through your stomach lining directly into your bloodstream. The remaining 80 percent moves into your small intestine, where absorption is even faster. From there, your liver does the heavy lifting, breaking alcohol down using an enzyme called alcohol dehydrogenase (ADH).
This enzyme works at a near-constant speed regardless of how much you’ve had. Think of it like a toll booth with a fixed number of lanes: cars keep lining up, but only so many can pass through per minute. For most people, that rate clears roughly one standard drink per hour. A standard drink in the United States contains 0.6 ounces (14 grams) of pure alcohol, which is equivalent to 12 ounces of regular beer (5% ABV), 5 ounces of wine (12% ABV), or a 1.5-ounce shot of liquor (40% ABV).
Estimating Your Timeline
The simplest way to estimate your time to sobriety is to figure out your approximate BAC and divide by 0.015. Here are some rough benchmarks, starting from when you stop drinking:
- 3 standard drinks (BAC ~0.05–0.07): About 3.5 to 5 hours to reach 0.00
- 5 standard drinks (BAC ~0.08–0.12): About 5.5 to 8 hours
- 8 standard drinks (BAC ~0.14–0.20): About 9 to 13 hours
- 10+ standard drinks (BAC ~0.18–0.25+): 12 hours or more
These are estimates. Your actual BAC depends on how quickly you drank, your body weight, your sex, and whether you ate beforehand. The ranges above assume an average-sized adult, so your personal numbers could fall outside them.
One common mistake is underestimating how many standard drinks you’ve actually consumed. A pint of craft beer at 8% ABV is closer to two standard drinks. A generous pour of wine at home can easily be 7 or 8 ounces instead of 5. A strong cocktail with two shots counts as two drinks, not one. Recounting with accurate pour sizes often reveals people drank more standard drinks than they thought.
Why It Takes Longer for Some People
Body weight plays a major role. Alcohol distributes through your body’s water content, so a smaller person reaches a higher BAC from the same number of drinks. The formula forensic experts use (the Widmark equation) accounts for this by including a distribution factor: roughly 0.68 for average-weight men and 0.55 for average-weight women. People with more body fat tend to have less water to dilute the alcohol, which raises their peak BAC.
Biological sex matters beyond body size. Men have highly active ADH enzymes in both their stomach and liver. The stomach enzymes alone can reduce alcohol absorption by about 30 percent before it ever reaches the bloodstream. Women produce almost no ADH in the stomach, and the ADH in their liver works less efficiently. This means women typically reach higher BAC levels from the same amount of alcohol and take longer to clear it.
Eating before or while you drink also changes the equation. When food is in your stomach, especially protein and fatty foods, a valve between your stomach and small intestine closes. This slows the flow of alcohol into the small intestine where most absorption happens, which lowers your peak BAC. It doesn’t change how fast your liver works once the alcohol is absorbed, but a lower peak means less total time to reach zero.
Nothing Speeds Up Your Liver
Coffee, energy drinks, cold showers, exercise, fresh air: none of these make the enzymes in your liver work faster. Caffeine can make you feel more alert, which creates a dangerous illusion of sobriety. You might feel more awake, but your reaction time, judgment, and coordination remain impaired. As the University of Arizona’s campus health program puts it plainly: “Time alone will sober you up.”
Drinking water and eating food after you’ve already been drinking can help you feel better and prevent a worse hangover, but they don’t lower your BAC any faster. The alcohol is already in your bloodstream, and your liver will clear it at its own pace.
Legal Limits and Driving
In 49 U.S. states, the legal BAC limit for driving is 0.08. Utah uses a stricter 0.05 limit. But “legal” and “sober” are not the same thing. Impairment begins well below 0.08: reaction time slows, peripheral vision narrows, and judgment weakens at BAC levels as low as 0.02 to 0.04.
If you’re trying to figure out whether you’re safe to drive the morning after heavy drinking, do the math carefully. Someone who stops drinking at midnight with a BAC around 0.15 won’t hit 0.00 until roughly 10 a.m. A 6 a.m. drive would still put them over the legal limit in every state. This “morning after” scenario catches many people off guard.
How Long Alcohol Shows Up on Tests
Even after you feel sober, alcohol or its byproducts can still be detected depending on the type of test:
- Blood test: Up to 12 hours after your last drink
- Breath test: 12 to 24 hours
- Urine test: 12 to 24 hours with standard testing
Specialized urine tests that look for alcohol metabolites rather than alcohol itself can detect drinking for up to 72 to 80 hours. These are sometimes used in workplace or court-ordered testing. Hair tests can detect alcohol use over a much longer window, typically up to 90 days, though they’re less common.
Practical Takeaways
Count your actual standard drinks honestly, accounting for pour size and ABV. Multiply the number of drinks by roughly one hour per drink as a starting point, then add a buffer. If you had your last drink at 1 a.m. and consumed six standard drinks over the evening, you’re looking at a realistic sobriety window of around 6 to 8 hours from that last sip, depending on your size and sex.
When in doubt, wait longer than you think you need to. The 0.015 per hour rate doesn’t negotiate, and your subjective feeling of “fine” almost always arrives before your BAC actually hits zero.