BAC Estimator
Rough estimate. Highly individual. Do not use to decide whether to drive — assume any alcohol = do not drive.
About this tool
Blood-alcohol concentration estimator using the Widmark formula.
Inputs
Sex, weight, drinks (each as ml × ABV %), time since first drink.
Formula
BAC = A / (r · m) − β · t, where A = grams of alcohol, m = body mass (kg), r = 0.68 (♂) / 0.55 (♀), β ≈ 0.015 %/h elimination.
Note: rough estimate. Do not use to decide whether to drive — assume any alcohol means do not drive.