Estimate your Blood Alcohol Concentration (BAC) based on weight, gender, drinks consumed, and time.

Whether you're planning a night out, driving home, or simply monitoring your alcohol intake, knowing your BAC can help you make safer and more informed decisions. Use this calculator to get a rough estimate of your current blood alcohol level.

What Is BAC?

BAC (Blood Alcohol Concentration) is a measure of the amount of alcohol in your bloodstream. It is typically expressed as a percentage. For example, a BAC of 0.05% means there are 0.05 grams of alcohol per 100 milliliters of blood.

How This BAC Calculator Works

To estimate your BAC, the calculator considers the following factors:

• Your weight (in kilograms)
• Your gender (male or female)
• Number of standard drinks consumed
• Time elapsed since your first drink (in hours)

The formula accounts for:

• Alcohol distribution ratios (different for males and females)
• The average rate at which the body metabolizes alcohol (approx. 0.015% per hour)

Understanding BAC Results

BAC Level	Effect
0.02%	Light relaxation, slight mood elevation
0.05%	Impaired judgment, reduced coordination
0.08%	Legal limit for driving in many countries
0.10%+	Significant impairment, slurred speech, reduced reaction time

Important: Even a BAC under the legal limit can impair driving ability and increase accident risk.

What Is a Standard Drink?

A standard drink typically contains about 10 grams (or 0.6 ounces) of pure alcohol, which is equivalent to:

• 285 mL of regular beer (approx. 4.8%)
• 100 mL of wine (approx. 12%)
• 30 mL of spirits (approx. 40%)

Legal and Safety Reminders

• Never drink and drive.
• Your actual BAC can vary depending on many factors, including hydration, food intake, medications, and individual metabolism.
• This calculator provides an estimate only — not a legally or medically accurate reading.

For precise results, use a breathalyzer or consult with a healthcare or law enforcement professional.

Calculate Your BAC

Enter your weight, gender, number of drinks consumed, and hours since your first drink to estimate your BAC.