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Blood Alcohol Calculator

Estimate your blood alcohol content (BAC) based on drinks, weight, gender, and time. Understand impairment levels.

Disclaimer: This is an estimate only. Do not drink and drive. Individual metabolism varies.

12 oz beer (5% ABV), 5 oz wine (12% ABV), 1.5 oz liquor (40% ABV)

Understanding Blood Alcohol Content

BAC measures how much alcohol is in your blood. It's affected by how much you drink, your weight, gender, and time.

Important: This is an estimate only. Individual metabolism varies. Never drink and drive.

BAC Impairment Levels

  • 0.02-0.03%: Slight relaxation, mild mood changes
  • 0.05-0.06%: Lowered inhibitions, impaired judgment
  • 0.08%: Legal limit - impaired coordination, reaction time
  • 0.10-0.12%: Significant impairment, slurred speech
  • 0.15%+: Major impairment, risk of blackout

Standard Drink Sizes

  • 12 oz regular beer (5% alcohol)
  • 5 oz wine (12% alcohol)
  • 1.5 oz spirits (40% alcohol)
  • 8-9 oz malt liquor (7% alcohol)

Factors Affecting BAC

  • Weight: Lower weight = higher BAC
  • Gender: Women typically have higher BAC from same drinks
  • Food: Eating slows absorption
  • Drinking speed: Faster drinking = higher peak BAC

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Frequently Asked Questions

What is BAC?

Blood Alcohol Content - the percentage of alcohol in your bloodstream. 0.08% is the legal limit for driving in most US states.

How is BAC calculated?

Using the Widmark formula: BAC = (Alcohol consumed × 5.14 / Weight × Gender constant) - (0.015 × hours)

How long does it take to sober up?

The body eliminates about 0.015% BAC per hour. There is no way to speed this up - only time works.

What counts as one standard drink?

12oz beer (5%), 5oz wine (12%), 1.5oz spirits (40%). All contain about 14g of pure alcohol.