How to sober up: what works and what is myth
The honest version first: nothing sobers you up fast. Your liver clears roughly one drink per hour at a pace nothing changes.2 Below is what the folk remedies actually do, and the timeline for the only method that works.
What did you drink?
- Beer330 mL can/bottle, 5%0
- Pint of beer500 mL, 5%0
- Glass of wine150 mL, 12.5%0
- Shot40 mL, 40%0
- Cocktailabout two shots of spirits0
- Hard seltzer330 mL, 4.5%0
Total: about 0.0 US standard drinks (0 g of alcohol). Odd pour? Convert it here.
We assume it was within the last 24 hours.
Credits what your liver cleared while you were still drinking. Skipping it keeps the most cautious estimate.
Sex
Sets the Widmark body-water ratio. Skipping is fine; it just widens the range.
No submit button here: the estimate appears on its own once three things are filled in.
- What you drank, using the counters (still needed)
- When your last drink was, including AM or PM (still needed)
- Body weight (40 to 250 kg, 88 to 551 lb) (still needed)
You will get a sober-by window, not a verdict: an honest range across how fast different bodies absorb and clear alcohol. The later edge is the one to plan around.
How to sober up fast
There is no fast. Alcohol leaves your body through enzymes, mainly alcohol dehydrogenase in the liver, which saturate early in a night of drinking and then run at maximum speed until the queue is done.3 That maximum is about 0.015 percentage points of BAC per hour: close to one US standard drink. It is the same while you sleep, jog, shower, or drink espresso. Anyone selling a shortcut is selling a feeling.
What you can control is the aftermath: how hydrated, fed, and rested you are when the alcohol finally clears. That is worth doing well, and it is a different project from lowering BAC.
The myths, one by one
| Method | Verdict | What it actually does |
|---|---|---|
| Coffee or an energy drink | Does not lower BAC | Caffeine blocks the sleepy feeling, not the alcohol. The result is a wide-awake drunk person, which studies suggest is more dangerous, because you feel more capable than you are. |
| A cold shower | Does not lower BAC | Startling, briefly refreshing, and metabolically irrelevant. Your liver does not check the thermostat. |
| Eating after you stopped | Does not lower BAC | Food matters before and during drinking, when it slows absorption. Once alcohol is in your blood, a kebab is comfort, not chemistry. |
| Sweating it out with exercise | Does not lower BAC | Only 2 to 5 percent of alcohol leaves through sweat, breath, and urine combined. A workout while impaired mostly adds injury risk to a hangover. |
| Drinking lots of water | Does not lower BAC | Excellent for the hangover, irrelevant to the number. Alcohol is not diluted out of blood by drinking water; it is metabolized by enzymes running at a fixed pace. |
| Making yourself vomit | Does not lower BAC | Only removes alcohol still in the stomach, which 30 to 90 minutes after drinking is not much. It does nothing about what is already in your blood. |
| Time | The only thing that works | Roughly one US standard drink cleared per hour, every hour, regardless of everything above. This is the entire secret. |
The caffeine row deserves its asterisk: alert-but-drunk people take more risks than sleepy-but-drunk ones, which has been measured.4
What to do with the waiting hours
- Rehydrate properly. Alcohol is a diuretic, and most of a hangover is fluid and electrolyte debt. Water works; water with electrolytes works better. Our sister site has a free homemade electrolyte drink calculator for exactly this morning.
- Eat when your stomach agrees. It will not lower your BAC, but it steadies blood sugar, which is part of why you feel wretched.
- Sleep, ideally more of it. Alcohol fragments sleep and suppresses the deep stages, so you wake under-slept even after a long night in bed. SleepTools covers the repair job.
- Do not drive. Not because a page told you, but because the estimator above cannot clear you and neither can how you feel.
Never drive after drinking. If you are wondering whether you are sober enough to drive, the answer is no.
When it is not a hangover: alcohol poisoning
Confusion, vomiting while drowsy, slow or irregular breathing, blue-tinged or clammy skin, seizures, or someone who cannot be woken are signs of alcohol overdose, and BAC can keep rising after a person passes out.1 That is an emergency call, not a sleep-it-off situation. In the US dial 911; in the Netherlands and the EU, 112.
Frequently asked questions
How do you sober up fast?
You cannot. Alcohol is cleared by liver enzymes that run at a fixed pace of roughly one US standard drink per hour, and no drink, food, shower, or supplement changes that rate. Everything marketed as a fast way to sober up changes how you feel, not your blood alcohol. The only honest strategy is to stop drinking, hydrate for the hangover, and give it the hours it needs.
Does coffee sober you up?
No. Caffeine counteracts sleepiness, so you feel sharper, but reaction time, judgment, and blood alcohol are unchanged. Researchers call the result a wide-awake drunk. Feeling sober while being impaired is more dangerous than knowing you are drunk, which is why coffee is the worst of the myths rather than the most harmless one.
Does throwing up help you sober up?
Barely, and only within the first hour or so. Vomiting removes alcohol that is still in the stomach, but absorption into the blood starts within minutes of drinking. Whatever has already been absorbed is beyond reach. If someone cannot stop vomiting, or vomits while drowsy or passed out, that is an emergency, not a sobering-up technique.
How long does it take to sober up completely?
Count your standard drinks and divide by roughly one per hour, then add a margin because bodies differ: the published elimination range spans 0.012 to 0.020 percentage points of BAC per hour. Six drinks means roughly six to twelve hours after the last one. The estimator on this page does that arithmetic for you and shows the honest window.
Does sleep help you sober up?
Sleep does not speed up elimination, but it is still the best use of the hours the process takes: alcohol wrecks sleep quality, impairment while unconscious is harmless, and being rested improves how you handle the hangover. Sleeping it off is correct advice about comfort and safety, as long as nobody treats waking up as proof of being sober.
What actually helps a hangover, then?
Water and electrolytes for the dehydration, food when your stomach accepts it, and time for everything else. None of this lowers BAC; it treats the aftermath. Rehydration is genuinely worth doing properly, which is what our hydration site covers in detail.
Related tools and answers
The estimator: when your BAC likely reaches zero, as an honest window.
How long does alcohol stay in your system?Blood, breath, urine, saliva, hair: the detection windows.
Standard Drink CalculatorCount the night correctly; cocktails are the usual undercount.
How these estimates workThe Widmark formula, every assumption, and every error source, cited.
Sources
- NIAAA. Understanding the dangers of alcohol overdose.
- Jones, A.W. (2010). Evidence-based survey of the elimination rates of ethanol from blood. Forensic Science International.
- Cederbaum, A.I. (2012). Alcohol metabolism. Clinics in Liver Disease.
- Marczinski, C.A. & Fillmore, M.T. (2006). Clubgoers and their trendy cocktails: implications of mixing caffeine into alcohol. Experimental and Clinical Psychopharmacology.