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Understanding alcohol and your body
How BAC Works
What Blood Alcohol Content actually measures, how your body processes alcohol, and why most BAC calculators get it wrong.
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Alcohol & Your Body
How alcohol is absorbed, what affects your metabolism rate, and why body composition matters more than weight alone.
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BAC Chart
Estimated BAC levels by weight, sex, and number of drinks. See where your limit might be before you go out.
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Blog
Tips for responsible drinking, alcohol facts, and updates about Alcophone.
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Quick Facts
Things most people don’t know about BAC
Most BAC calculators use a formula from the 1980s
The Watson-Widmark method assumes alcohol distributes evenly in body water. It doesn’t. Peer-reviewed research (Norberg et al., 2003) showed alcohol distributes 65% in lean tissue and only 14% in fat tissue.
Body fat percentage matters more than weight
Two people weighing 180 lbs can have wildly different BAC levels from the same drinks. An athletic person (12% body fat) and someone with 35% body fat will process alcohol very differently.
The US has unique body composition stats
With a 42.4% adult obesity rate and 80%+ sedentary lifestyles, the average American body is significantly different from the European populations these formulas were calibrated on.
Your liver processes alcohol at ~0.015% per hour
This rate varies by weight, age, sex, and liver health. No amount of coffee, water, or food will speed it up once alcohol is in your blood. The only cure is time.
0.08% is the legal limit — but impairment starts at 0.02%
Reaction time, judgment, and coordination begin declining well below the legal limit. That’s why Alcophone tracks five risk levels, not just “legal” or “over.”
Track Your BAC with Science
Alcophone uses peer-reviewed formulas calibrated for the US — not guesswork.
Alcophone provides BAC estimates only. It is not a breathalyzer and cannot measure your actual blood alcohol content. Never drive after drinking, regardless of what any app says. Must be 21+ to use. © 2026 SafeMetrics4U. All rights reserved.