BAC Calculator
Estimate blood alcohol concentration from drinks and time.
Widmark method
Drink presets
Clear timeline
BAC is an estimate
This calculator provides an educational estimate only. Actual BAC varies by metabolism and drinking pattern.
Assumptions
Calculations assume U.S. standard drinks (14 g alcohol each) and Widmark distribution factors. You can choose the alcohol elimination rate (0.010–0.020%/hr), which changes the estimate.
Never drive impaired
If you have been drinking, arrange a safe ride and avoid operating vehicles or machinery.