Calculateur d'Alcoolémie — Formule

Widmark Formula for BAC

BAC = (Alcohol in grams / (Body weight in grams x r)) x 100 - 0.015 x hours

Where:

  • 1 standard drink = 14 grams of alcohol
  • r = 0.73 for males, 0.66 for females (body water ratio)
  • 0.015 = average BAC reduction per hour

    • Legal Limits

    BACStatus 0.00%Sober 0.02-0.04%Mild effects 0.05-0.07%Impaired 0.08%+Legally intoxicated (most US states)

    Exemple Résolu

    A 180 lb male who had 3 drinks over 2 hours.

    1. Alcohol = 3 x 14 = 42 grams
    2. Weight = 180 x 453.6 = 81,648 grams
    3. BAC = (42 / (81,648 x 0.73)) x 100 - 0.015 x 2
    4. = 0.0705 x 100 - 0.030 = 0.041%