Advanced BAC Calculator

How to use: Enter your weight in pounds, select your sex, hours since first drink, stomach condition, and add your drinks in ounces with ABV. You can use quick presets or add custom drinks. Click Calculate to see your estimated BAC. Reset will clear all inputs.

BAC Calculator

The Blood Alcohol Content (BAC) Calculator is a simple tool that helps you estimate the amount of alcohol in your bloodstream based on your weight, sex, number of drinks, and the time since you started drinking. It is designed for educational purposes only and should never be used to decide if it is safe to drive. Even a small amount of alcohol can impair your ability to drive safely.

What Is a BAC Calculator?

A BAC Calculator uses a scientific formula known as the Widmark equation to give you an estimate of your current BAC level. This formula takes into account your body weight, biological sex, how many drinks you have had, and how long you have been drinking. It helps you understand how alcohol may be affecting your body and judgment, but it cannot provide an exact number like a breathalyzer or blood test can.

How to Use the BAC Calculator

Using the calculator is very simple. You just need to enter your weight in pounds, choose your sex, and input how many standard drinks you have consumed. A standard drink in the United States equals 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of liquor. Finally, enter how many hours it has been since your first drink. The calculator will then estimate your BAC level.

Remember, the result is only an approximation. Many factors such as your metabolism, whether you ate food, or medications you take can change your real BAC level.

Why This Matters

Knowing your BAC is important because driving with a BAC of 0.08% or higher is illegal in most U.S. states. However, even at lower levels, alcohol can affect your coordination, vision, and reaction time. The safest choice if you have been drinking at all is to avoid driving.

Frequently Asked Questions

Is this calculator 100% accurate?

No. The calculator only gives an estimate. The only reliable way to know your actual BAC is through a breathalyzer or a blood test performed by professionals.

What is a standard drink?

In the U.S., a standard drink equals about 14 grams (0.6 fluid ounces) of pure alcohol. This is usually found in 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of distilled spirits such as vodka, whiskey, or rum.

How long does it take to sober up?

On average, your body lowers BAC by about 0.015% per hour. If your BAC is 0.08%, it may take around 5 to 6 hours before you are completely sober. However, this rate can vary for each person.

Can I use this calculator to decide if I can drive?

No. This calculator is for educational purposes only. Never rely on it to make decisions about driving. If you have been drinking, the safest decision is always not to drive.

Disclaimer

This BAC Calculator is provided for general information only and should not be considered legal or medical advice. If you are facing a DUI charge or have concerns about alcohol use, consult with a licensed professional or attorney in your state.