BAC Calculator
Estimate BAC
Estimate blood alcohol content using the Widmark formula
Formula
BAC = (Alcohol oz × 5.14) / (Weight × r) - 0.015 × hours | r = 0.68 (male) or 0.55 (female)
Frequently Asked Questions
What is a standard drink?
One standard drink = 14g of pure alcohol = 12 oz beer (5%), 5 oz wine (12%), or 1.5 oz spirits (40%). A strong IPA (7%) in a 16 oz pint = ~1.9 standard drinks.
How long until I'm sober?
The body metabolizes about 0.015% BAC per hour. At 0.08% BAC, it takes about 5.3 hours to reach 0.00%. Nothing speeds this up — not coffee, water, or cold showers.
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