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 scientifically 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 example, even if Drunk Calc estimates that your blood alcohol concentration is below the legal driving limit for your Country, it will still strongly encourage you to find an alternative way home. 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

While it's true that every Country has its own legal alcohol limit for driving, most Countries set the limit somewhere between 0.05% and 0.08%. That range is far too broad for Drunk Calc. When you enter your personal details in our BAC calculator, we will lookup the exact legal alcohol limit for your Country. However, alcohol limits have been known to change over time, so it's always a good idea to familiarize yourself with the legal alcohol limit in your Country.

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 peak BAC is (and when you will reach it), what your current BAC is, when your BAC will be below the legal driving limit, and when your BAC will reach 0.

Step 1: Personal Details

Enter your personal details below to get started.


Weight & Height Units

Step 2: Drink Details

Enter the details of the drinks you've consumed.

Drink Size Units

Hunger Level

Step 3: Your Results

All done! Your estimated BAC is displayed below.