Blood Alcohol Content (BAC) Calculator

Estimate your Blood Alcohol Content (BAC) based on your body weight, gender, drinks consumed, and time passed since drinking began.

Blood Alcohol Content Calculator

Blood Alcohol Content Calculator

Measurement System
Gender
lbs
hours
kg
hours

Number of Drinks Consumed

%

%

Explore Blood Alcohol Content (BAC) Calculator

About Blood Alcohol Content (BAC) Calculator

The Blood Alcohol Content (BAC) Calculator is a powerful tool designed to promote safer driving decisions after alcohol consumption. Alcohol affects individuals differently depending on various physiological factors, and understanding your estimated BAC level can be a crucial step in making responsible choices, especially when it comes to driving.

This tool is especially relevant in real-life situations where people may underestimate their level of impairment. For example, a college student at a party, a professional at a networking event, or a social drinker at dinner may not feel “drunk” but could still be above the legal limit to drive. NGDrives’ BAC Calculator offers a fast, easy-to-use interface that helps users evaluate their alcohol consumption with clarity and science-based estimates.

The BAC Calculator considers gender (as men and women metabolize alcohol differently), weight (since body mass affects alcohol distribution), type and number of drinks consumed, and the amount of time that has passed since the first drink. It accommodates both imperial and metric systems, ensuring accessibility for global users.

For instance, someone weighing 140 lbs who has consumed three glasses of wine over two hours might see an estimated BAC around 0.07%—close to the legal limit in many jurisdictions. That user could then use this estimate to decide to wait longer, drink water, or arrange alternate transportation.

Although the tool doesn’t replace legal testing or medical advice, it empowers individuals with knowledge that can help prevent DUI incidents, reduce risks, and protect both the user and others on the road. Whether you’re a driver, event host, or safety-conscious individual, the BAC Calculator supports your effort to make smarter, safer decisions.

 

How Blood Alcohol Content (BAC) Calculator Works

Inputs:

  • Measurement System: Choose between Imperial (lbs) or Metric (kg).
  • Gender: Select either Male or Female (affects the alcohol distribution ratio).
  • Body Weight: Enter your weight in lbs or kg depending on the system chosen.
  • Time Passed Since First Drink: Input the number of hours since drinking began.
  • Drinks Consumed: Input the number of drinks for each of the following:

Beer (12oz, ~5% ABV)

Wine (5oz, ~12% ABV)

Liquor (1.5oz, ~40% ABV)

  • Optional Inputs: Include dose in grams and body weight in grams for more precise scientific input.

Calculation:
The calculator uses the Widmark formula, adjusting for gender, body weight, drink volume, and alcohol content, to estimate your current BAC. It also subtracts alcohol metabolized over time.

Output:
Your result will display as an estimated BAC percentage (e.g., 0.06%), giving you a snapshot of your potential level of intoxication.

FAQs for Blood Alcohol Content (BAC) Calculator

1. How accurate is this BAC calculator?

This tool provides an estimate based on standard physiological formulas. It's not legally binding or medically exact, but it gives a close approximation useful for awareness.

2. Why does gender impact BAC levels?

Biological differences in body water content and metabolism rates mean that women typically reach higher BAC levels than men after consuming the same amount of alcohol.

3. Can this tool tell me if I’m safe to drive?

No. Even if your BAC is under the legal limit, alcohol can impair judgment and reaction time. If you’ve been drinking, it’s safest not to drive.

4. What’s a “standard drink”?

A standard drink typically contains 14 grams of pure alcohol: Beer: 12oz (~5%) Wine: 5oz (~12%) Liquor: 1.5oz (~40%)

5. Does food affect BAC?

Yes. Eating before or while drinking can slow alcohol absorption, potentially lowering peak BAC levels.

6. Can coffee or water reduce my BAC?

No. Only time reduces BAC. Coffee, cold showers, or water may help with alertness, but won’t affect how your body processes alcohol.

Report an Issue with Blood Alcohol Content (BAC) Calculator

If you encounter any issues or have suggestions for improvements, please report them using the form below.

Support: Report Issue

Maximum file size: 268.44MB

We'll only contact you if we need more info.
Consent

Sponsored