health

Blood Alcohol Content (BAC)

The percentage of alcohol in a person's bloodstream, used to measure intoxication level.

Blood Alcohol Content (BAC) is measured as grams of alcohol per 100 mL of blood. A BAC of 0.08% is the legal limit for driving in most US states.

Widmark Formula

BAC = (Alcohol in grams / (Body weight in grams × r)) − (0.015 × hours), where r = 0.68 for men, 0.55 for women.

Effects by BAC Level

  • 0.02%: Mild relaxation, slight mood elevation
  • 0.05%: Reduced inhibitions, impaired judgment
  • 0.08%: Legal limit — poor coordination, slower reaction time
  • 0.15%: Major impairment of balance and movement
  • 0.30%+: Risk of loss of consciousness or death

Related Calculators

📊 BAC Calculator

Related Terms

BMI (Body Mass Index)

A numerical value calculated from height and weight, used as a screening tool for body fat categories.

BMR (Basal Metabolic Rate)

The number of calories your body burns at complete rest to maintain basic life functions.

TDEE (Total Daily Energy Expenditure)

The total number of calories burned per day, including exercise and daily activities on top of BMR.

Macronutrients

The three main nutrients the body needs in large amounts: protein, carbohydrates, and fats.

Body Fat Percentage

The proportion of total body weight that is composed of fat tissue.

Blood Pressure

The force of blood pushing against artery walls, measured as systolic over diastolic pressure.