BAC Calculator
Results
Enter your drinks and select Calculate BAC to view your estimated result.
Estimated BAC0.000%Model-based estimate
US standard drinks (14 g)0
Pure alcohol0 g
Estimated peak*0.000%
Calculated clearance*—
Educational estimate only. Never use this calculator to decide whether it is safe or legal to drive. Actual BAC may be higher or lower; alcohol absorption can continue after the last drink.
Modeled BAC over timehours since first drink
*The peak assumes all entered alcohol is absorbed at the start of the model, not at its actual drinking time. Clearance is a mathematical projection, not a sobriety or driving time. The chart is not a physiological absorption curve.
Calculation steps & formulas
Widmark-style estimate: BAC (%) = (ethanol grams ÷ (body mass grams × distribution factor)) × 100 − (elimination rate × elapsed hours), floored at zero. Uses 0.789 g/mL ethanol density. Distribution factors are population approximations and do not describe every individual.