For most people, two to three standard drinks consumed within an hour will produce noticeable intoxication, and four or more will push blood alcohol concentration (BAC) to 0.08% or higher, the legal limit for driving in every U.S. state. But that number shifts dramatically depending on your body size, biological sex, whether you’ve eaten, and how quickly you’re drinking.
What Counts as One Drink
A standard drink in the United States contains 0.6 ounces (14 grams) of pure alcohol. That works out to 12 ounces of regular beer at 5% alcohol, 5 ounces of wine at 12%, or a single 1.5-ounce shot of 80-proof liquor at 40%. Malt liquor is stronger than regular beer, so a standard serving is only 8 ounces at 7%.
These numbers matter because many real-world drinks contain more alcohol than one standard serving. A pint of craft IPA at 7% is closer to two drinks. A generous restaurant pour of wine can easily be 8 ounces instead of 5. A strong cocktail with two shots of spirits counts as two drinks before you factor in any liqueurs. If you’re trying to gauge how much alcohol you’re actually consuming, the label on the container and the size of the pour matter more than the number of glasses.
How Body Size Changes the Math
Alcohol distributes through your body’s water. A larger person has more blood volume and more water to dilute the alcohol, so the same number of drinks produces a lower BAC. Someone who weighs 120 pounds will reach 0.08% BAC significantly faster than someone who weighs 200 pounds, even if they drink at the same pace.
Body composition plays a role too. Muscle tissue contains more water than fat tissue, so two people at the same weight can have different BAC levels depending on how much of their body is muscle versus fat. More muscle means more water to dilute the alcohol, which means a lower peak concentration.
Why Women Typically Feel It Faster
Women generally reach higher blood alcohol levels than men after drinking the same amount, even when body weight is similar. Several biological factors drive this. Women tend to carry proportionally more body fat and less water than men, so alcohol is distributed through a smaller volume of fluid and becomes more concentrated. Hormonal differences also affect how quickly alcohol is processed.
There’s an enzymatic component as well. In younger adults, men produce more of the stomach enzyme that begins breaking down alcohol before it enters the bloodstream. This “first-pass metabolism” means less alcohol reaches the blood intact. The difference narrows with age, and by around 60 it largely disappears, but in younger drinkers it gives men a measurable advantage in processing the same number of drinks.
Eating Before or While Drinking
Drinking on an empty stomach is one of the fastest ways to get drunk. When your stomach is empty, alcohol passes quickly into the small intestine, where most absorption happens. Food, especially protein and fat, triggers a valve at the bottom of the stomach to close during digestion. This keeps alcohol trapped in the stomach longer, slowing its entry into the bloodstream and reducing the peak BAC you reach.
A full meal before drinking won’t prevent intoxication, but it can meaningfully blunt the spike. The same three drinks that make you noticeably impaired on an empty stomach may produce a milder, more gradual effect after a large dinner. This is why drinking with food consistently leads to lower peak intoxication than drinking without it.
How Quickly BAC Rises and Falls
After your last drink, blood alcohol levels typically peak within 30 to 60 minutes. That means you can still be getting more intoxicated well after you stop drinking, which catches a lot of people off guard. If you down several drinks quickly and then stop, you may feel relatively fine for a while before the full effect hits.
Your liver eliminates alcohol at a roughly fixed rate: about 0.015% BAC per hour on average, which works out to slightly less than one standard drink per hour for most people. You can’t speed this up with coffee, cold showers, or food. If you reach a BAC of 0.08%, it will take approximately five to six hours for your body to return to zero. Drinking faster than your liver can process is exactly how BAC climbs, and the gap between intake speed and elimination speed determines how drunk you get.
Tolerance Changes How Drunk You Feel
Regular drinkers often notice they need more alcohol to feel the same effects. This is functional tolerance, and it’s real but misleading. Your brain adapts to alcohol’s presence, so you can walk, talk, and feel relatively normal at a BAC that would visibly impair someone who rarely drinks. But your actual BAC and the rate your body processes alcohol don’t change with tolerance. Your reaction time, judgment, and coordination are still impaired at the same levels, even if you don’t feel it.
This creates a dangerous gap. A person with high tolerance may feel sober enough to drive while their BAC is well above the legal limit. Tolerance changes your subjective experience of being drunk. It does not change what alcohol is doing to your brain and body.
Rough Estimates by Body Weight
These are approximate ranges for reaching a BAC around 0.08% within one hour, assuming no food in the stomach:
- 100 to 120 pounds: 2 to 3 standard drinks
- 140 to 160 pounds: 3 to 4 standard drinks
- 180 to 200 pounds: 4 to 5 standard drinks
- 220 pounds and above: 5 or more standard drinks
Women should generally estimate toward the lower end of each range, and men toward the higher end, due to the differences in body water and enzyme activity described above. These numbers shift upward if you’ve eaten a substantial meal and downward if you’re drinking on an empty stomach, are sleep-deprived, are taking certain medications, or are dehydrated.
Keep in mind that “feeling drunk” is subjective. Many people notice impairment well before 0.08%. Relaxation, lowered inhibitions, and slowed reaction time often begin around 0.03% to 0.05%, which for a lighter person can be just one or two drinks. By the time you feel obviously drunk, your BAC is likely already at or past the legal limit.
Drinking Speed Matters More Than Total Amount
Because your liver can only process roughly one standard drink per hour, pacing is the single biggest factor you can control. Four drinks spread over four hours produces a very different experience than four drinks in one hour. In the first scenario, your liver keeps up with intake and your BAC stays relatively low. In the second, alcohol accumulates faster than it’s eliminated and your BAC spikes.
This is also why shots and chugging are so effective at producing rapid intoxication. They deliver a large dose of alcohol in seconds, far outpacing your body’s ability to process it. The same total volume sipped slowly over an evening would produce a fraction of the peak BAC.