BAC Calculator

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

Enter Your Values

Gender

Body Weight (lbs)

Number of Drinks

Time Since First Drink (hours)

1 drink = 12oz beer (5%), 5oz wine (12%), or 1.5oz spirits (40%)

Results

Fill in your values above and click Calculate.

Frequently Asked Questions

Q.How accurate is this BAC calculator?

BAC estimates vary significantly based on metabolism, food intake, medication, and tolerance. This is for educational use only — never rely on it to determine if you are safe to drive.

Q.What is the legal BAC limit for driving?

In the US: 0.08%. UK: 0.08% in England/Wales, 0.05% in Scotland. Australia: 0.05%. Always err on the side of caution.