Blood Alcohol Content (BAC) Calculator

Estimate your BAC using the standard Widmark formula.

Disclaimer: Do not use this to determine if it is safe to drive.This calculator provides a rough estimate for educational purposes only. Actual BAC depends on genetics, food intake, metabolism, and exact alcohol percentage. Never drink and drive.

Biological Sex

Weight (lbs)

Standard Drinks Consumed

1 standard drink = 12oz beer (5%), 5oz wine (12%), or 1.5oz liquor (40%).

Hours Since First Drink

Estimated BAC

0.049%

Increased Impairment

How is this calculated? This tool uses the widely accepted Widmark formula. The body metabolizes alcohol at a relatively constant rate of about 0.015% BAC per hour.

Factors like having a full stomach can delay absorption, but do not change the total amount of alcohol your liver must process.