BAC Calculator

Estimate blood alcohol content with the Widmark formula - all in your browser.

Sex

Weight lb

Standard drinks

One standard drink = 14g pure alcohol - a 12oz 5% beer, 5oz of wine, or 1.5oz of spirits

Hours since first drink

Use metric units (kg)

Estimated BAC

0.00% Sober

Metabolism averages 0.015% per hour (Widmark formula)

0.0 h

Hours until 0.00%

Estimates only - never drink and drive.