For most people, two to three standard drinks consumed within an hour will produce noticeable intoxication, and four to five drinks in two hours will push blood alcohol concentration (BAC) to 0.08% or higher. But the real answer depends heavily on your body weight, biological sex, how much you’ve eaten, and how quickly you’re drinking. A 140-pound woman reaches a higher BAC on the same number of drinks than a 200-pound man, sometimes dramatically so.
What Counts as One Drink
Before counting drinks, you need to know what a “standard drink” actually means, because it’s smaller than what most people pour. In the United States, one standard drink contains 0.6 ounces (14 grams) of pure alcohol. That translates to:
- Beer: 12 ounces at 5% alcohol (a regular can or bottle)
- Malt liquor: 8 ounces at 7% alcohol
- Wine: 5 ounces at 12% alcohol
- Liquor or spirits: 1.5 ounces (one shot) at 40% alcohol (80-proof)
A pint of craft IPA at 7% alcohol is closer to two standard drinks, not one. A generous wine pour at a restaurant can easily be 8 ounces, which is about 1.5 standard drinks. If you’re using these numbers to estimate how drunk you’ll get, the accuracy of your drink count matters a lot.
How Body Weight and Sex Change the Math
Your body weight is one of the biggest variables. A lighter person has less water volume in their body to dilute the alcohol, so BAC rises faster. Biological sex matters too: women generally reach higher BAC levels than men at the same weight and number of drinks, because women typically carry a higher proportion of body fat and less body water. Alcohol dissolves in water, not fat, so there’s less volume to absorb it.
Here’s what the numbers look like in practice. For men, two drinks bring a 100-pound person to roughly 0.08% BAC, while a 180-pound person stays around 0.04%. Three drinks push a 140-pound man to about 0.08%, but a 200-pound man only hits 0.06%. Four drinks get a 160-pound man to 0.09%, solidly impaired.
For women, the curve is steeper. Two drinks bring a 120-pound woman to approximately 0.08% BAC. Three drinks push a 140-pound woman to about 0.11%, and four drinks bring a 160-pound woman to roughly 0.11% as well. A 120-pound woman who has four drinks in two hours could reach 0.15%, which is nearly double the legal driving limit in most states.
These estimates assume drinks consumed over a relatively short window. For every 40 minutes of drinking time, you can subtract roughly 0.01% from the total, since your body is processing alcohol as you go.
What Each BAC Level Feels Like
The number on a BAC chart corresponds to real, measurable changes in how your brain and body work. At 0.01% to 0.05%, you feel relaxed and slightly less alert, with a mild loosening of judgment. This is the “buzzed” range, one or two drinks for most people.
Between 0.06% and 0.15%, the effects become more obvious: slurred speech, reduced coordination, impaired balance, and poor memory. This is where most people would describe themselves as “drunk.” Judgment is significantly compromised, even if you feel fine.
From 0.16% to 0.30%, you’re dealing with difficulty walking and speaking, drowsiness, confusion, nausea, vomiting, and memory blackouts. This is dangerous territory. Above 0.31%, there’s a real risk of losing consciousness, respiratory failure, coma, and death.
Why Eating Before Drinking Matters So Much
About 20% of alcohol gets absorbed through the stomach wall, while the remaining 80% passes into the small intestine, where absorption happens much faster. When you have food in your stomach, particularly protein and fatty foods, a valve between your stomach and small intestine closes to allow digestion. This keeps alcohol trapped in the stomach longer, slowing the rate at which it enters your bloodstream.
The practical difference is significant. Drinking on an empty stomach means alcohol hits your small intestine almost immediately, and your BAC spikes quickly. Drinking after a full meal delays that spike and spreads it out, so your peak BAC is lower even if you drink the same total amount. This is why the same three beers can feel very different depending on whether you had dinner first.
Tolerance Changes How Drunk You Feel, Not How Impaired You Are
Regular drinkers often need more alcohol to feel the same effects, which creates a false sense of security. There are two main types of tolerance at work. Metabolic tolerance means your liver gets more efficient at breaking down alcohol over time, so your BAC doesn’t climb as high from the same number of drinks. Functional tolerance is different and more deceptive: your nervous system adapts to alcohol’s presence, so you feel less drunk even though your BAC and actual impairment may be high.
Someone with high functional tolerance might seem perfectly composed at a BAC that would have someone else stumbling. But their reaction time, judgment, and coordination are still compromised. Tolerance also resets over time. If you haven’t been drinking regularly and then have a heavy night, you’ll feel the effects much more intensely than you did months ago.
Binge Drinking Thresholds
The NIAAA defines binge drinking as a pattern that brings BAC to 0.08% or higher. For a typical adult, that’s five or more drinks for men and four or more drinks for women within about two hours. Those numbers line up closely with the BAC charts: four drinks in two hours will put most women over 0.08%, and five drinks will do the same for most men, depending on weight.
Binge drinking is the most common form of excessive alcohol use. It doesn’t require being a heavy or frequent drinker. A single night of four to five drinks in a couple of hours qualifies.
How the Type of Alcohol Affects the Experience
A shot of vodka and a shot of whiskey contain the same amount of pure alcohol, and they’ll raise your BAC by the same amount. But the overall experience can differ because of congeners, which are trace chemical compounds produced during fermentation. Darker alcohols like bourbon, whiskey, and dark beer have higher congener content than lighter options like vodka and light beer.
Congeners don’t significantly change how intoxicated you get, but they do affect how you feel the next day. Research comparing bourbon and vodka found that bourbon, with its higher congener content, produced more severe hangover symptoms. The difference between light beer and vodka, though, wasn’t large enough to matter much. If you’re trying to minimize the aftermath, lighter-colored drinks have a slight edge, but the total amount of alcohol you consume is still what matters most.
The Legal Line for Driving
In 49 U.S. states, the legal BAC limit for drivers 21 and older is 0.08%. Utah sets its limit lower, at 0.05%. Impairment starts well below the legal threshold. At 0.04% to 0.05%, your alertness and judgment are already declining, even if you wouldn’t describe yourself as drunk. For a 160-pound man, that’s roughly two drinks. For a 140-pound woman, it could be as few as one or two.
Your body processes alcohol at a relatively fixed rate, roughly one standard drink per hour for most adults. That means if you’ve had four drinks over two hours, it will take approximately two more hours after your last drink before your BAC returns to zero. Time is the only thing that sobers you up. Coffee, water, and food won’t speed up the process.