Frequently Asked Questions

On average, your body eliminates alcohol at a rate of 0.015% BAC per hour. This means one standard drink (14g of alcohol) takes roughly one hour to process for most adults. Total sober-up time depends on your weight, sex, and how much you drank. There is no way to speed this process up — coffee, water, food, and sleep do not metabolize alcohol faster. Use our calculator for a personalized estimate.

Alcohol is detectable in your blood for up to 12 hours, in your urine for 24–48 hours (or longer with heavy drinking), and on your breath for 12–24 hours. Hair follicle tests can detect alcohol use for up to 90 days. For driving purposes, the relevant question is when your BAC drops below the legal limit — which our calculator estimates based on your weight, sex, and drinks consumed.

No. The liver processes alcohol at a fixed rate that cannot be meaningfully accelerated. Popular myths like eating a big meal, drinking coffee, taking a cold shower, or exercising do not increase the rate of alcohol metabolism. Time is the only remedy. However, eating before or during drinking can slow the initial absorption of alcohol, which reduces your peak BAC — it doesn't eliminate the alcohol any faster, but it reduces the peak.

No. Neither water, coffee, food, nor cold showers speed up the rate at which your liver processes alcohol. Drinking water helps with hydration and can reduce hangover symptoms. Coffee may make you feel more alert — but it does not lower your BAC. In fact, feeling more alert while intoxicated can be dangerous, as it may give you a false sense that you're sober enough to drive.

It depends on your weight, sex, and how quickly you drank them. Two standard beers (12oz, 5% ABV) contain roughly 28g of alcohol. For a 160lb man, this produces a peak BAC of around 0.04–0.06% — near or above the legal limit in many countries. For a lighter person or a woman, the BAC would be meaningfully higher. Use the Am I Sober? calculator to get a personalized estimate before deciding.

The legal BAC limit varies by country. In the United States, Canada, Australia, and the UK it is 0.08%. In most of Europe (Germany, France, Spain, Italy) it is 0.05%. In Sweden, Japan, and Norway it is 0.02%. Commercial drivers in the US face a lower limit of 0.04%. Drivers under 21 in the US face near-zero tolerance (0.00–0.02%). Our calculator shows you when you'll drop below both 0.08% and 0.05% thresholds.

There is no universal safe number. It depends on your body weight, sex, metabolism, and the strength of your drinks. As a rough guide, one standard drink per hour keeps most average-weight adults near or below 0.05% BAC. But individual variation is significant — the only responsible approach is to use a calculator or a certified breathalyzer, and when in doubt, don't drive.

BAC stands for Blood Alcohol Content. It measures the percentage of alcohol in your bloodstream. A BAC of 0.08% means 0.08 grams of alcohol per 100ml of blood. At 0.02–0.05%, most people experience mild relaxation and slightly impaired judgment. At 0.05–0.08%, reaction time and coordination are noticeably affected. At 0.15%+, most people experience significant loss of coordination and memory blackouts.

The calculator uses the Widmark formula — the scientific standard for estimating BAC used in forensic science and legal research. It is reasonably accurate for most adults using standard drink sizes. However, it is an estimate, not a medical measurement. Individual factors like food intake, medications, liver health, body composition, and genetics can cause your actual BAC to differ from the estimate. Always treat the result as a guide and err on the side of caution.

Women typically reach a higher BAC than men after the same amount of alcohol for two reasons. First, women on average have a higher percentage of body fat and lower body water content — and alcohol distributes through body water, not fat. Second, women generally produce less alcohol dehydrogenase, the enzyme that breaks down alcohol. This is reflected in the Widmark formula, which uses a distribution ratio of 0.68 for men and 0.55 for women.

In the United States, a standard drink contains 14 grams of pure alcohol. This is equivalent to: 12oz of regular beer at 5% ABV, 5oz of wine at 12% ABV, or 1.5oz of distilled spirits at 40% ABV. Many cocktails, craft beers, and generous pours contain more than one standard drink — this is one of the most common reasons people underestimate how much alcohol they've actually consumed.

Passing out after heavy drinking can be dangerous. Alcohol continues to be absorbed into the bloodstream even while you sleep, meaning your BAC can rise after you've fallen asleep. There is also a risk of choking on vomit. Anyone who has drunk a very large amount should be monitored and placed in the recovery position (on their side) rather than left on their back. If someone is unresponsive, call emergency services immediately.

This depends entirely on the specific medication. Many common drugs — including acetaminophen (Tylenol), sleep aids, antihistamines, and anxiety medications — have dangerous or even fatal interactions with alcohol. Always consult your doctor or pharmacist. As a general rule, wait until your BAC has fully returned to 0.00% before taking any medication that warns against alcohol use.

A hangover is caused by several factors working together: dehydration (alcohol is a diuretic), inflammation triggered by alcohol byproducts like acetaldehyde, disrupted sleep quality (alcohol suppresses REM sleep despite making you feel sleepy), and low blood sugar. Symptoms typically peak when BAC returns to zero and can include headache, nausea, fatigue, and sensitivity to light and sound. Drinking water before bed, eating, and sleeping enough can reduce severity.

Tolerance does not lower your BAC — it only changes how you feel at a given BAC. Someone with high alcohol tolerance may feel relatively sober at 0.10% BAC, while their driving ability, reaction time, and decision-making are still severely impaired. This is one of the most dangerous misconceptions about alcohol. The Widmark formula calculates actual BAC regardless of tolerance level.