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 to 90 minutes. That means if you stop drinking at midnight with a BAC of 0.08 (the legal limit in most U.S. states), your blood alcohol level won’t hit zero until about 5:20 a.m. at the earliest. But “leaving your body” can mean different things depending on whether you’re talking about feeling sober, passing a breathalyzer, or clearing a urine test.
How Your Body Processes Alcohol
Your liver does the heavy lifting. It produces an enzyme that breaks alcohol into a toxic byproduct called acetaldehyde, a known carcinogen. A second enzyme quickly converts that into acetate, which the body then breaks down into water and carbon dioxide for easy elimination. This two-step process happens at a mostly fixed pace. You can’t rush it.
About 5 to 10 percent of alcohol leaves through your breath, sweat, and urine. The rest has to go through the liver. One standard drink in the U.S. contains about 14 grams of pure alcohol, which is equivalent to a 12-ounce beer, a 5-ounce glass of wine, or 1.5 ounces of liquor. Your liver processes roughly one of these per hour.
Estimated Clearance Times by Number of Drinks
Since your BAC drops by about 0.015 per hour, you can estimate how long it takes for alcohol to fully clear your bloodstream based on how much you drank. These are rough estimates for an average-sized person:
- 2 drinks: approximately 2 to 3 hours
- 4 drinks: approximately 4 to 6 hours
- 6 drinks: approximately 7 to 10 hours
- 8 drinks: approximately 10 to 13 hours
- 10 drinks: approximately 12 to 16 hours
These ranges vary based on body size, sex, food intake, and liver health. Someone who weighs 130 pounds will have a higher BAC from the same number of drinks than someone who weighs 200 pounds, and they’ll need more time to clear it.
Detection Windows for Different Tests
How long alcohol is “detectable” depends entirely on what test is being used. A standard blood or breath test can detect alcohol for up to about 12 hours after your last drink. This is the type of test used during traffic stops or in emergency rooms.
Urine tests that look for a metabolite called EtG have a much longer window. After a few drinks, EtG can show up in urine for up to 48 hours. After heavier drinking, that window can stretch to 72 hours or longer. These tests are commonly used in court-ordered monitoring, workplace programs, and treatment settings. Hair tests can detect alcohol use over an even longer period, typically 90 days, though they are less commonly used.
What Slows Alcohol Elimination Down
Several factors influence how quickly your body clears alcohol. The biggest ones are body composition and biological sex. Women generally absorb more alcohol and take longer to process it than men, even when drinking the same amount. This is largely because women tend to have less body water and more body fat, which concentrates alcohol in the bloodstream. Hormonal differences also play a role.
Eating before or while you drink makes a significant difference in how fast your BAC rises, though it doesn’t change the elimination rate once alcohol is in your blood. Food holds alcohol in your stomach longer, where absorption is much slower than in the small intestine. This means your peak BAC will be lower and delayed compared to drinking on an empty stomach, effectively giving your liver more time to keep up.
Liver health matters too. If your liver is damaged from chronic heavy drinking or other conditions, the enzymes responsible for breaking down alcohol work less efficiently. This means alcohol stays in your system longer and its toxic byproducts linger, causing more harm with each drink.
Why Coffee and Cold Showers Don’t Help
Your liver processes alcohol on a fixed schedule. No amount of coffee, cold water, exercise, or sleep will speed that up. Coffee can make you feel more alert, which sometimes creates the illusion of sobriety, but your BAC remains exactly where it was. This is actually more dangerous than doing nothing, because it can trick you into thinking you’re fine to drive when you’re not.
The only thing that lowers your blood alcohol level is time. Drinking water and eating food can help you feel better and may reduce hangover symptoms, but they don’t accelerate the rate at which your liver breaks down alcohol.
The Morning After Problem
One of the most underappreciated risks is still being over the legal limit the morning after a night of heavy drinking. If you had eight drinks and stopped at midnight, your BAC might not reach zero until 10 a.m. or later. Many people are pulled over for impaired driving the morning after without realizing they’re still legally intoxicated.
If you need to be completely clear of alcohol for a test, a drive, or any situation where impairment matters, count your drinks and do the math. Take your estimated peak BAC, divide by 0.015, and that’s roughly how many hours you need. When in doubt, add a couple of extra hours as a buffer, since individual variation can slow things down beyond the average rate.