Blood Alcohol Calculator BAC Calculator Drunk Calc

Drunk Calc is the best way to accurately estimate your blood alcohol level online. Using its advanced algorithm, Drunk Calc can predict how drunk you are.

BAC Calculator - Blood Alcohol Calculator | Drunk Calc
Drunk Calc Algorithm

Estimate Blood Alcohol Level

Drunk Calc uses a sophisticated algorithm to accurately estimate your blood alcohol level. We take important pieces of information such as your height, weight, biological sex, hunger level, how many drinks you've consumed, and how long you've been drinking, to predict your current blood alcohol level. No other BAC calculator has an algorithm quite as comprehensive as Drunk Calc's.

Drunk Calc Believes In Safety First

Safety first approach

Drunk Calc's main purpose is to help reduce the number of alcohol-related fatalities on the road. One of the many ways we achieve this is by having a zero-tolerance approach to driving while drunk. For this reason, Drunk Calc will never compare your estimated blood alcohol concentration to the legal driving limit for your Country. Drunk Calc will always encourage you to find an alternative way home, whether that be a taxi, an uber, or a long walk. Learn more about the dangers of driving while drunk, as well as why you shouldn't drive even if you've only had a few drinks, on our FAQ page.

Drunk Calc Is Free

Free Blood Alcohol Calculator

Tying in to our main goal, we believe that everyone should be able to easily, accurately, and freely estimate their blood alcohol content. That's why Drunk Calc is, always has been, and always will be, free to use for everyone. If Drunk Calc can help prevent even 1 alcohol-related death by offering a free, accurate, easy-to-use BAC calculator, then we have done our job.

Legal Alcohol Limit

Legal Alcohol Limit

Every Country has its own legal alcohol limit for driving, and most set the limit somewhere between 0.05% and 0.08%. While Drunk Calc is a fantastic BAC calculator, there is always room for error. That is why we will never compare your estimated BAC to the legal alcohol limit for driving in your Country. If you have had even one alcoholic drink, our advice will always be to refrain from driving. If you're curious about the legal alcohol limit for driving in your Country, Wikipedia has a list with every Country's legal limit.

Drunk Calc Additional Features

Drunk Calc features

We are constantly improving Drunk Calc, and one of the ways we do this is by releasing new and exciting features all of the time. The latest and greatest feature added to Drunk Calc was the chart feature. You may notice that when you use the BAC calculator, there is a chart that appears below your results. This chart will tell you what your current BAC is, what your peak BAC is (and when you will reach it), and when your BAC will reach 0%.

Step 1: Personal Details

Enter your personal details below to get started.


Change to lbs
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Step 2: Drink Details

Enter the details of the drinks you've consumed.

Drink Type

Hunger Level

Clear all drinks

Step 3: Your Results

All done! Your estimated BAC is displayed below.