Blood Alcohol Calculator

Estimate your Blood Alcohol Concentration (BAC) using the Widmark formula.

Weight (lbs)

# Drinks

Hours Passed

Estimated BAC

0.087

DUI Limit Exceeded (US)

*Disclaimer: This is just an estimate based on averages. True BAC depends on exact drink strength, food consumption, and individual metabolism. Do not rely on this to determine if it is safe to drive.

About Blood Alcohol Calculator

This is a free, fast, and fully client-side blood alcohol calculator tool. All processing is done locally within your browser to ensure maximum privacy and security. No data is sent to our servers. Bookmark this page for quick access to ad-free, high-performance SEO and developer utilities.