A single standard drink takes about one hour to be fully metabolized by the average person, though it can remain detectable on certain tests for much longer. Your body breaks down alcohol at a remarkably steady rate of about 0.015 to 0.020 percent blood alcohol concentration (BAC) per hour. Since one drink typically raises your BAC to somewhere between 0.02 and 0.04 percent, most people will have zero measurable alcohol in their blood roughly one to two hours after finishing that drink.
What Counts as “One Drink”
A standard drink in the United States contains 0.6 ounces (14 grams) of pure alcohol. That translates to 12 ounces of regular beer at 5% alcohol, 5 ounces of wine at 12%, or a 1.5-ounce shot of 80-proof liquor at 40%. These are smaller portions than many people expect. A craft IPA at 8% alcohol in a pint glass, a generous wine pour, or a strong cocktail with two shots can easily equal 1.5 to 2.5 standard drinks, even though it feels like “just one.”
How Your Body Processes Alcohol
Once you take a sip, alcohol is absorbed through the stomach lining and small intestine into your bloodstream. Your BAC rises until it peaks, usually within 30 to 45 minutes on an empty stomach. From there, your liver does nearly all the work, breaking down alcohol at a fixed rate that you can’t speed up with coffee, water, or food after the fact.
That fixed rate, roughly 0.015 to 0.020 BAC per hour, means your body doesn’t care how much you’ve had. It processes alcohol at the same plodding pace whether you had one drink or five. The only difference is how long the line is. For a single drink that brings you to around 0.02 to 0.03 BAC, you’re looking at about one to two hours to return to 0.00.
Factors That Change the Timeline
That one-to-two-hour estimate is an average. Several things shift it in either direction.
Food
Eating before or while you drink has a major effect. In one study, people who drank on an empty stomach reached a peak breath alcohol concentration of about 30.5 micrograms per 100 milliliters, while those who ate a light meal beforehand peaked at just 21.4, roughly 30% lower. Food also reduced the total amount of alcohol that made it into the bloodstream: after a meal, only about 66 to 71% of the consumed alcohol was actually absorbed, compared to nearly 100% on an empty stomach. In practical terms, eating a meal before one drink can meaningfully reduce both how intoxicated you feel and how long the alcohol lingers.
Biological Sex
Women generally reach a higher BAC than men after drinking the same amount. The main reason is body composition: women typically carry a lower proportion of body water, so alcohol is more concentrated in a smaller volume. Women also tend to have smaller liver volumes and lower overall elimination rates measured in grams per hour, meaning the alcohol takes slightly longer to clear. This doesn’t mean one drink becomes dangerous for women, but it does mean the timeline to reach 0.00 BAC may be a bit longer.
Body Weight
A 120-pound person will hit a higher BAC from one drink than a 200-pound person, simply because there’s less body mass to dilute the alcohol. More weight generally means more body water and a larger liver, both of which speed up the process.
Age
As you get older, your body composition shifts and liver function can slow down. Research on alcohol pharmacokinetics has confirmed that elimination rates vary across age groups, with older adults sometimes processing alcohol more slowly than younger ones.
How Long Tests Can Detect One Drink
There’s an important distinction between “metabolized” and “detectable.” Your body may finish processing that single drink within two hours, but traces of alcohol or its byproducts can show up on tests well beyond that window.
- Breath test (breathalyzer): Generally detects alcohol for as long as it’s still being metabolized. For one drink, that’s roughly one to two hours after your last sip.
- Blood test: Can detect alcohol in your system for up to about 12 hours after your last drink, though for a single drink, levels would likely drop below the detectable threshold well before that.
- Standard urine test: Similar to blood, alcohol itself clears from urine within several hours for a single drink.
- EtG urine test: This is where things change dramatically. EtG tests don’t look for alcohol itself but for a metabolic byproduct your body produces when breaking it down. After a few drinks, EtG can be present in urine for up to 48 hours, sometimes 72 hours or more with heavier drinking. Even a single drink can trigger a positive result at lower cutoff levels. Many testing programs use a 100 ng/ml cutoff, which is sensitive enough to pick up small amounts of drinking, while forensic or court-ordered programs may use a higher 500 ng/ml threshold for greater certainty.
- Hair follicle test: Alcohol markers can appear in hair strands for one to six months. Even a single heavy drinking episode can produce concentrations high enough for a positive result, though hair tests are generally designed to identify patterns of use rather than a one-time drink.
Practical Timeline for One Standard Drink
If you’re a person of average weight who had one standard drink with some food in your stomach, here’s a realistic picture. Your BAC will peak within about 20 to 45 minutes. It will return to 0.00 within roughly one to two hours. A breathalyzer won’t pick it up after that point, and a blood test is very unlikely to flag anything beyond a few hours. But if you’re subject to EtG urine testing, that single drink could show up for 24 hours or more depending on the cutoff your program uses.
If you drank on a completely empty stomach, are a smaller person, or are female, add some buffer time. If you’re a larger male who ate a full meal, the alcohol may clear faster than average. These differences are real but modest for a single drink. The gap between fastest and slowest metabolism matters far more when multiple drinks are involved.
Why You Can’t Speed It Up
Your liver processes alcohol at a fixed enzymatic rate, and nothing you do changes that pace. Cold showers, exercise, energy drinks, and black coffee will make you feel more alert, but they don’t lower your BAC or help your body eliminate alcohol any faster. Time is the only thing that works. For one drink, the good news is that you don’t need much of it.