BAC Calculator
Estimate your blood alcohol content level.
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Time to 0.00
Time to 0.08
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Frequently Asked Questions
How is BAC calculated?
Using the Widmark formula: BAC = (alcohol consumed / (body weight × gender constant)) - (0.015 × hours elapsed).
What is a standard drink?
12 oz beer (5%), 5 oz wine (12%), or 1.5 oz spirits (40%). All contain about 14 grams of pure alcohol.
Is this calculator accurate?
BAC estimates are approximate. Actual BAC depends on many factors: food consumed, medications, metabolism, and individual variation.
What BAC is the legal limit?
0.08% in all US states for drivers 21+. Many countries have lower limits. Any impairment level can be dangerous.
How long does alcohol take to leave my system?
Your body metabolizes about 0.015% BAC per hour. Nothing speeds this up — not coffee, food, or cold showers.