Why do women get more intoxicated from same alcohol?
Women have lower body water percentage (55% vs 68%), so alcohol is less diluted.
Health Fitness
Blood Alcohol Content (BAC) Calculator
Estimate your BAC level based on drinks consumed, weight, and gender factor
Stay Safe and Informed
Get an approximate BAC to understand impairment risk
What this calculator does
Blood Alcohol Content (BAC) is alcohol concentration in your bloodstream, measured as percentage by weight. The Widmark formula estimates BAC based on drinks consumed, body weight, sex, and time elapsed.
How it works
Widmark calculates how alcohol distributes through body water. Women reach higher BAC from same consumption due to lower body water percentage.
Formula
BAC = (Alcohol grams ÷ (Weight kg × Distribution ratio)) - (0.015 × Hours). Male ratio: 0.68, Female: 0.55.
Tips for using this calculator
- This provides estimates only—actual BAC varies ±20%
- Food slows absorption and reduces peak BAC by 20-30%
- Only time reduces BAC—not caffeine or cold showers
- Women reach higher BAC than men at equivalent consumption
- Never drive above 0.08% (most US states' legal limit)
Frequently asked questions
How long to sober up?
About one standard drink per hour. BAC 0.16% needs 8-10 hours to reach zero.
How accurate is this calculator?
Estimates vary ±20% from actual BAC due to individual factors.