DO NOT DRIVE BASED ON THESE RESULTS.. This BAC calculator provides an estimate only. By using this calculator you accept full legal responsibility for your actions and release this site from all liability.

Drunk Calculator

The most accurate BAC calculator online

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Breathalyzers Know exactly how drunk you are

BAC Effects Chart
BACEffects
0.01-0.04%• Relaxation and warmth
0.04-0.08%• Euphoria and confidence
• Minor impairment of judgement, speech, reaction time, memory, and balance
0.08-0.12%• Driving is illegal
• Obvious impairment of judgement, speech, reaction time, memory, and balance
0.12%+May occur:
• Unstable emotions (anger, depression, and/or unease)
• Dizziness/nausea/vomiting
• Blackouts (memory loss)
• If slow breathing or unable to wake up: get medical attention immediately

What is BAC (blood alcohol concentration)?

Blood alcohol concentration, or BAC, is the amount of alcohol in your blood written as a percentage. A BAC of 0.08% means there are 0.08 grams of alcohol for every 100 milliliters of blood. Alcohol usually shows up in your bloodstream within 30 to 70 minutes of your first drink, and how drunk you feel tracks closely with that number.

This BAC calculator estimates your level from the drinks you enter, your weight, your sex, and how much time has passed. It is a guide, not a breath or blood test, so never use it to decide whether you are safe to drive.

The legal limit

In every U.S. state the legal limit for driving is 0.08% if you are 21 or older. Utah is the exception at 0.05%. Drivers under 21 are held to much stricter zero-tolerance rules, with limits that fall between 0.01% and 0.05% depending on the state. Commercial drivers are usually capped at 0.04%. Going over these numbers can mean a DUI, lost license, fines, or jail time.

What counts as one drink

A standard drink in the U.S. contains about 14 grams of pure alcohol. That works out to roughly:

  • 12 oz of regular beer at around 5% ABV
  • 5 oz of wine at around 12% ABV
  • 1.5 oz of liquor at around 40% ABV (a single shot)

Craft beers, large pours, and mixed drinks often hold more than one standard drink, so it is easy to underestimate how much you have had. If you are not sure how strong something is, check our guides on beer, wine, and hard liquor.

How the calculator works

Our estimate is based on the Widmark formula, the same method used in most BAC calculators. It converts each drink into grams of alcohol, spreads that across the water in your body (which is tied to your weight and sex), and then subtracts what your liver has already burned off. On average the body clears about 0.015% BAC per hour, and that rate does not speed up no matter what you do.

Only time lowers your BAC

Coffee, a cold shower, fresh air, water, and greasy food are the usual suggestions, and none of them actually sober you up. They might make you feel more alert, but your BAC keeps dropping at the same slow pace no matter what. The only thing that brings it down is time. If you want the full picture, read how long being drunk lasts.

Why everyone is different

Two people can drink the same amount and end up with very different BAC levels. Body weight, body composition, sex, food in your stomach, hydration, medications, and how fast you drink all change the result. Women tend to reach a higher BAC than men from the same drinks because of differences in body water. Because of all this, treat any estimate as a rough number rather than a hard fact.

Effects at different BAC levels

Impairment climbs steadily as your BAC rises. A drink or two brings mild relaxation and lowered inhibition. By 0.08% your reaction time, judgment, and coordination are clearly affected, which is why that is the legal cutoff for driving. Past 0.15% you are looking at heavy impairment, nausea, and blackouts, and levels above 0.30% can be life threatening. The chart above breaks down what tends to happen at each stage.

Drink responsibly

This tool is here to help you understand alcohol, not to help you push your limits. If you have been drinking, plan a ride, call a Uber or Lyft, or wait it out. A calculator can never replace good judgment, and when there is any doubt, the safe choice is to not drive.

My liver hates me