What BAC is the legal driving limit?

In most of the US, UK, and Australia the legal driving limit is 0.08% BAC. Many countries have stricter limits of 0.05% or even 0.02%. Always check local laws.

How fast does the body metabolise alcohol?

The liver metabolises approximately 0.015% BAC per hour. This rate is fairly constant and cannot be significantly sped up by coffee, water, or food.

Is this calculator medically accurate?

No. This is an educational estimate based on the Widmark formula. Actual BAC varies due to food intake, hydration, liver health, medications, and individual metabolism. Never drink and drive.

Blood Alcohol Content (BAC) Calculator

The Blood Alcohol Content (BAC) Calculator estimates the concentration of alcohol in your bloodstream based on the number of standard drinks consumed, your body weight, biological sex, and time elapsed since your first drink. This tool is for educational purposes only. BAC is affected by many individual factors including food intake, hydration, and metabolism. Never drink and drive.

Standard Drinks Consumed

Body Weight(kg)

Biological Sex

Hours Since First Drink(hours)

How to Use This Calculator

1
Enter the number of standard drinks consumed (1 standard drink = 14 g pure alcohol).
2
Enter your body weight in kilograms.
3
Select your biological sex.
4
Enter the number of hours since your first drink.
5
Click Calculate to see your estimated BAC.

Frequently Asked Questions

In the US, one standard drink contains 14 grams of pure alcohol — equivalent to 355 ml regular beer (5%), 148 ml wine (12%), or 44 ml spirits (40%).

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