Blood Alcohol Content Calculator
Estimate your current blood alcohol level using the Widmark formula. This is an educational tool — individual metabolism varies widely and this should never be used to decide whether to drive.
Understanding Blood Alcohol Content
What is a Standard Drink?
One standard drink contains 10g of pure alcohol. That equals: 330ml regular beer (5%), 100ml wine (13%), or 30ml spirits (40%). A large glass of wine or pint of strong beer is often 2+ standard drinks.
The Widmark Formula
BAC = (alcohol consumed in grams ÷ (weight in grams × distribution ratio)) − (elimination rate × hours). The distribution ratio is 0.68 for men and 0.55 for women. Elimination averages 0.015% per hour.
Important Disclaimer
This tool is for education only. Metabolism varies based on food consumption, medications, liver health, and genetics. The only safe BAC for driving is zero.
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