BAC Calculator

Estimate your blood alcohol content based on drinks consumed, time elapsed, body weight, and gender. Uses the Widmark formula. See your estimated BAC and how long until you reach 0.00%.

For educational purposes only. BAC estimates are approximations and can vary significantly based on food, medications, individual metabolism, and other factors. Never drive if you've been drinking.

Body Weight

Gender

Number of Drinks

Hours Spent Drinking

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

The liver processes approximately 0.015% BAC per hour. There is no way to speed up this process — coffee, water, and food do not reduce BAC, only time does.