A BAC (Blood Alcohol Content) calculator estimates the concentration of alcohol in your bloodstream based on drinks consumed, body weight, gender, and time since drinking.
About this calculator
A BAC (Blood Alcohol Content) calculator estimates the concentration of alcohol in your bloodstream based on drinks consumed, body weight, gender, and time since drinking. BAC is measured in grams of alcohol per 100 mL of blood, expressed as a percentage.
BAC calculations are only estimates. Actual impairment varies based on tolerance, food intake, hydration, medications, and individual metabolism. Never use this as a guide for driving decisions.
Common uses
- Estimate BAC after a specific number of drinks
- Determine how long to wait before driving after drinking
- Understand how body weight affects alcohol absorption
- Plan safe alcohol consumption at events
Frequently asked questions
What is the legal BAC limit for driving?
In India, the legal BAC limit is 0.03% (30 mg of alcohol per 100 mL of blood). In the US, it is 0.08%. In most of Europe, 0.05%. Professional drivers in India have a lower limit of 0.01%.
How fast does BAC drop after drinking?
The liver metabolizes alcohol at approximately 0.015% BAC per hour, regardless of coffee, food, or exercise. If your BAC is 0.09%, it takes about 6 hours to reach 0%.